here's the run down, the car is a 94 firebird M6 LT1 misses badly above 4000 rpms and seems down on power lower in the rpm range. Problem has been getting progressively worse over time. The idle varies by a few hundred rpm while it's trying to idle as well and the problem exist in closed loop and open loop

It has new plugs gapped at .050 Autolite 104s

Taylor OVC wires that appear to be fine, one year old

an opti that is two years old with maybe 8000 miles on it

new ignition coil wire

New blaster coil

Ignition module is off of a 70,000 mile engine, when I swapped them the problem didn't change

the fuel pressure regulator is new as well

No SES light is being thrown either



took opti off yesterday after the problem got so bad the car wouldn't even run for more than about 5 seconds, start right up but would die, opti had oil all over the inside, the rotor was tarnished heavily as were 6 of the 8 contacts, fixed oil leaks, cleaned up pick ups and the rotor, cleaned out all of the oil from the opti, car runs better, but still not right




cam is 224/236 on a 114, gasket matched heads and intake 1.6 roller rockers, TPIS longtube headers just your typical head and cam car with exhaust

 

Sounds like maybe a fuel filter..if u havnt replaced that i would.
Also go ahead and do the plugs and wires agin

 

found th eproblem it wasn't ignition related at all, a few of my lifters exploded and I wasn't opening alot of the valves

 

holy shi** that sucks.did the missfire or whatever happen all the time or just when the car warmed up.im guessing all the time

 

yeah it happened all the time, I've been having problem with the lifters with this combo, I'm not sure why I've busted a few in the past as well, time to try something different