Try new plugs and wires. I had a 2008 2500HD work truck that did the same thing after 80K. Took it into our shop and had them replace the plugs and wires. Good as new.

 

My 5.3 does the same thing and it only has 35k miles on it. It's kind of annoying, but I have just learned to live with it. Mine does it sometimes worse than others, so it may be something to do with the quality of the fuel.

 

i was thinking the same thing about fuel quality also, but i NEVER buy discount gas, and always try to buy top tier fuel. i have a friend who works at a chevy dealer and he says that intake gaskets fail alot on these trucks, and it usually sets a misfire code also.

would it even be worth my time to do the plugs and wires at this mileage? or just a waste of time and money?

 

Welcome to chevy, everyone ive had does that. You described it bet tho, a stumble or small shudder at idle...mine are all 5.3s tho

 

A trip to the local shop would help. They can read everything that's happening with their scan tool, and they'll be able to pick up that misfire or stumble, or whatever it is. A truck can still misfire and not throw codes, so my advice would be to have them look at it, and then replace the plugs and wires, and then see if that fixes it.

 

i was thinking the same thing about fuel quality also, but i NEVER buy discount gas, and always try to buy top tier fuel. i have a friend who works at a chevy dealer and he says that intake gaskets fail alot on these trucks, and it usually sets a misfire code also.

would it even be worth my time to do the plugs and wires at this mileage? or just a waste of time and money?

I buy the good gas as well. I think at your low miles it would be a waste of money to change the plugs out. If you were having a misfire, the check engine light would be on and it would set a code.

 

My mechanic told me the misfire has to reach a certain level of severity before the light goes on... maybe that's just me. My truck had countless misfires due to that crankshaft sensor issue, and the light would only flash at certain times.

 

You are correct, I should have said that the misfires will show on the diagnostic scanner's log. He can have someone hook up a diagnostic scanner and it will show if and which cyliner has a misfire.

 

thanks for all the replies!! my buddy is a tech at chevrolet and has all day access to a tech 2 so ill have him hook up to it one saturday when hes working and see if its actually misfiring. starspangled6.0 is correct..... misfires have a certain threshold they have to break before it will trip the cel and set a code.

do you HAVE to have a crank relearn done anytime a tune up is done?

 

Some techs have joined recently, and that's what they say. It takes 15 minutes with a guy and a scanner, so it's easy enough.

 

Mine will do that every once in a while if I don't drive it for a few days. Once I pull out of the drive and get to the stop sign a few feet down the road it's done and over with. I consider it a normal thing becuase I just rolled over 20K.

 

well at least im not the only one with this little "problem" lol. when i get around to changing the plugs and wires whats the best route to go? i know the factory iridum plugs are highly regarded, along with the factory ac delco wires. BUT has anyone here tried the pulstar iridum plugs? they dont appear to be junk like the e3 plugs.

i might be a guinea pig and try these plugs unless someone can honestly say they have had a bad experience using them.

 

OEM plugs and wires are the only way to go, man. The other stuff is only going to cause problems.

 

10-4. ill get the oem plugs and wires ordered and installed then go to the dealer and get the crank relearn and have them further check for misfires.

thanks again for everyones input!!

 

My mechanic told me the misfire has to reach a certain level of severity before the light goes on... maybe that's just me. My truck had countless misfires due to that crankshaft sensor issue, and the light would only flash at certain times.

Did replacing the crank shaft sensor fix you problem? I keep thinking that is my problem and everybody says when that sensor goes bad it will just not start,

 

I had the sensor reset, and that fixed it.

 

I've got the same thing...quite annoying.
I've replaced plugs, wires, air filter, cleaned throttle body and maf and had Christian Brothers do a crank relearn.
When you guys are saying a crank sensor reset, is that the same thing as a crank sensor relearn?
I just don't get it, feels just like a slight miss, but its not, no cel, and the truck runs fine down the road. I know I have a bad BCM that I will be replacing to fix other issues, but I don't see how that would have anything to do with it. Somebody mentioned it could be a motor mount issue, but I don't see any problems with mine. Maybe I just need to replace the crank sensor? The relearn that Christian brothers did, (or said they did) didn't do anything, so maybe I should just have GM do it when I take it back to the shop. Has everybody in this thread fixed their issue by the crank sensor reset and/or relearn?