I've got a buddy with a '99 K1500 RCSB 4.3 V6, it's stone stock and has about 150,000 on it. It is misfiring under load, especially climbing hills. It flashes the SES light and throws a code when it does this stating "Random / Multiple Misfires". We replaced the cap and rotor today and it didn't help. He put new e3 plugs in it about six months ago trying to fix the problem. I'm out of ideas any help would be appreciated.
in advance.
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. -
Vacuum leaks, o2 sensors are the most common problems I've run into.
http://i10.photobucket.com/albums/a1...dited-copy.jpg
2007 Sierra crew 5.3 4wd, stock for now
2004 Sierra scsb 5.3 - sold
02 Z28 SLP cold air pack, Corsa exh, Center Force dual friction + 23 lb flywheel
66 Chevy C20 (collecting dust)
why not put some orignal a/c plugs back in it, since its all stock
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
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