once at operating temp, truck is sluggish - So basically the truck runs good until its at temp. It does have a slight tremble at idle from startup, but once ...

1990GMC · by **1990GMC** [OP] » Jul 29 2010, 8:21pm

So basically the truck runs good until its at temp. It does have a slight tremble at idle from startup, but once it is hot and driven for a while it seems to develop a miss or something similar. I'm not real good when it comes to distributor cars so any ideas would be great.

Related Topics lack of power and p01p02 code Power locks and Power Mirrors How much power Best way to get more power? How to get the most power out of my 4.3L Power enrichment power windows Power Steering switched power Power Steering? how much power difference. start off power Power Steering Power For AMP

koolz71 · by **koolz71** » Jul 30 2010, 6:01am

almost sounds like an 02 or emissions related issue..i could be wrong though..just has that ring to it

Trumpster1 · by **Trumpster1** » Jul 30 2010, 2:18pm

Does your service engine light come on at all? You could always take it to AutoZone to run a quick scan on it to see if any codes do come up. It's free and could give you some guidance on where to start. koolz71 I think is on the right track, does sound emission related. It could be a very simple fix. Good luck!

fatty · by **fatty** » Aug 03 2010, 10:05pm

mine does this to. not all the time and it doesnt pull up any codes.. what should i try to replace first?

AMI CUSTOMS · by **AMI CUSTOMS** » Aug 04 2010, 12:36am

My first thought would be a bad or wore out cat, then plugs, then plug wires, then coil, then fuel pump or fuel pump relay or fuel filter. All those things cause those types of issues, O2 sensor will just cause the vehicle to run in protect mode and almost always comes with a check engine light.

fatty · by **fatty** » Aug 05 2010, 1:09am

plugs are new ac delco irridium. new ac delco wires. have msd 8.5mm wires that i will install this weekend. no fuel filter, its in tank. I run sea foam or berrymans about every third fill up.

zTech71 · by **zTech71** » Aug 05 2010, 2:11pm

I would lean towards AMI CUSTOMS first thought. The catalytic converter is possibly clogged. A lot of the time they breakdown over time into pieces. I have seen this problem cause a check engine light to illuminate and sometimes not. Use a rubber hammer and tap on the converter usually you can hear the piece moving around the are loose. Hope it helps.

fatty · by **fatty** » Aug 05 2010, 10:35pm

ill give that a shot this weekend. thanks!

zTech71 · by **zTech71** » Aug 06 2010, 1:29am

also hold a piece of paper to the tailpipe or your hand to feel the exhaust. You will def feel a differance if the exhaust is clogged. A piece of paper should blowing sideways.

71 cuda man · by **71 cuda man** » Aug 07 2010, 11:58am

I would change the pvc valve also & check egr also.Your fuel filter should be on inside frame rail on drivers side of truck.if you used seafoam I'd say replace it.Seafoam works great almost to good chances are it cleaned inside of tank & crud got into filter making it clog up.I learned that one the hard way.

Random Image Attachments
Grille guard Attached by: 430Silverado
Snow Wheeling Attached by: retseort
OFFICIAL-Leveling kit pi... Attached by: gmctruckguy
The Worst Exterior Mods Attached by: Silverado55

once at operating temp, truck is sluggish - So basically the truck runs good until its at temp. It does have a slight tremble at idle from startup, but once ...

Lack of Power

Lack of Power

Re: Lack of Power

Re: Lack of Power

Re: Lack of Power

Re: Lack of Power

Re: Lack of Power

Re: Lack of Power

Re: Lack of Power

Re: Lack of Power

Re: Lack of Power

Common search terms

Who is online

Engine Forum
This is where all of our engine discussion and conversation takes place. Talk about engine diagnostics, adjustments, modifications, performance and care. Motor tuning and repair to gain horsepower and fuel efficiency.
Post a new topic To create a new topic in Engine, click this button:
Previous topic Next topic