i had the same problem and it ended up being a plugged cat.
i had the same problem and it ended up being a plugged cat.
Nothing stock...I either broke it or replaced it before I broke it!!
run a compression test.if it is stock i would put ac plugs in it.ck for vacuum leaks.put a good set of plug wires on it
+1 on the plug wires..sounds like secondary ignition problem
2008 GMC Sierra SLE....370ci LY6 with some goodiesSOLD
1995 C2500- LS1 swap with a mp112
build thread- http://www.ls1truck.com/forums/lsx-t...-ls1-swap.html
Thanks for all the input we will start trying what you guys have said. I was thinking plug wires too but didnt want to just keep throwing parts at the thing.
Kyle - 2004 K1500 Z71 RCSB 5.3- Nelson 93 Octane Tune - LPP Long Tubes + Y - Gibson Extreme Duals - Cut Up Stock Air Box - 10.95 @ 67 in the 1/8 -- '05 Pickup Front Brakes - '05 Suburban Rear Brakes - Russel Stainless Braided Hoses -- DTRL's Turned to Park Lights - 4-HI Mod - '05 SS Seats -- I downshift near hybrids so they can hear me hurting the environment. -
Could have had a bad plug originally, then when he installed the new plugs, he could have cracked one, it's very easy to do and sometimes you won't even notice it. it won't hurt to check them again.
that many miles, original plug wires?
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Get it on a scanner and see which cylinders are misfiring or if all of them. That will greatly narrow down the problems it could be.
Definately sounds like a plugged cat. Put it in drive step on the brake and rev it up without spinning the tires. Open the door and point your ear towards the ground underneath the truck. You should be able to differentiate the misfire sound between an engine issue or it being choked up with exhaust. If he has never put cats on it look no further. ASE Certified here.
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