94 LT1 Misfire

94 Lt1 out of a Corvette in 95 Z28 with 32k original miles. Good Compression. Pacesetter 3 1/2" longtubes into 2 1/2" pipes back to dual flowmasters, no cats. Misfire when warm through the powerband and above 3k when cold.

-You can hear the misfire going steadily, increased revs from 2k-2.5k-3k-4k
Replaced:
Opti
Plugs/Wires
Throttle Position Sensor
Fuel Filter, Pump (255 lph)
No emissions (EGR, EVAC, AIR, et cetera)

I hate my life.

[kikib]

Fuk these lt1 cars.. I have one, been dealing with something similar for 3 years now.

[IAMDAVEAMI]

oi
try replacing your opti hehe thats hwat 98% of the problems is wiht this thing is and looks like you lie in a very very moist place soo keep your car dry and inside or a cover ove rit keeps the opti dry and not wet
and make sure you seal it good and get trhe MSD vent opti too if not then check your coil and plus and ground and wires hehe
THE END
::)

[robertcrowley]

I have a 2002 firebird with the 3.8 l engine. I didn't no what was going on for awhile but it turned out it had a blow head gasket from the previous owner. But also lt1 engines have all kinds of things that could cause that but before you go start buying parts get it checked out so you don't waist any money