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JL8Jeff · 05-24-2011, 02:05 PM

It almost sounds like you have an electrical issue with cyl 1 either the injector harness or spark plug wires or possibly a big vacuum leak on that cylinder that is cause it to go so lean it misfires. I don't know the V6 engine setup well enough, but is there any vacuum or AIR line that goes to that cylinder? Does part of the EVAP go to that port, it might be pulling EVAP constantly and if a hose is cracked it could be a constant leak. Or could the intake gasket have gone bad around that port allowing air to leak in and leaning it out? It could be the leaning out causes so many misfires that it goes into limp mode and shuts down or stalls out.

05-24-2011, 02:05 PM	#31
JL8Jeff Hippy Mod, Bergermeister Meisterberger, Moderator Join Date: Aug 2004 Location: Ewing Posts: 6,216 iTrader: (3)	It almost sounds like you have an electrical issue with cyl 1 either the injector harness or spark plug wires or possibly a big vacuum leak on that cylinder that is cause it to go so lean it misfires. I don't know the V6 engine setup well enough, but is there any vacuum or AIR line that goes to that cylinder? Does part of the EVAP go to that port, it might be pulling EVAP constantly and if a hose is cracked it could be a constant leak. Or could the intake gasket have gone bad around that port allowing air to leak in and leaning it out? It could be the leaning out causes so many misfires that it goes into limp mode and shuts down or stalls out. __________________ 69 Z28 JL8 4 wheel disc brakes - being restored 09 Silverado Z71 Last edited by JL8Jeff; 05-24-2011 at 02:05 PM.