Appreciate it sir!

 

I don't think pushing the accelerator will do anything if the throttle body is electronically controlled. You could hold the throttle open but not sure if that messes with the computer settings.

 

Holding the throttle pedal down while cranking will put it to clear flood mode, which means it will let it crank but won't start.

 

changed the spark plugs and coil pack

id guess wiring before i though mechanical.
you can get new coil pack wirng harness from the locl parts yard, or order brand new.
Plus id check the ground at the back of the head for the coil packs.
compression test is pretty quick and easy, you can check the plug and adjecent plugs in about 10 mins and have a ood idea if there is an issue..
but you didnt mention mileage, or anything other than 4.8 in the heading so we have zero clues to go off of.

 

id guess wiring before i though mechanical.
you can get new coil pack wirng harness from the locl parts yard, or order brand new.
Plus id check the ground at the back of the head for the coil packs.
compression test is pretty quick and easy, you can check the plug and adjecent plugs in about 10 mins and have a ood idea if there is an issue..
but you didnt mention mileage, or anything other than 4.8 in the heading so we have zero clues to go off of.

Truck has 200,000 miles and just had lifters replaced, it just started the po302 code you can't tell it's misfiring only with the scanner.

 

12499225 ac delco lifters , it was ticking when my brother gave it to me, but it started a po302 code misfire and I think the so called mechanic didn't know what the hell he was doing, I can't even find the bastard after paying him $1800 .