BsGreenZ

OK so we put a 4 bolt main LT1 into a 94 Trans Am. It has a LT4 hot cam kit, ported and polished heads, long tubes, new opti, new wires, new plugs, new fuel pump and filter, tuned computer.. Hell just about every sensor has been replaced but it has a miss fire. The wires and plugs have been checked along with avery thing else. At idle it runs fine with no miss fire but as soon as you give it gas a miss fire begins. I dont think his computer went bad but maybe there is a clogged injector? I was wanting to go put my computer in the car and my fuel rail with my injectors on it and see what happens. This kid is so pissed off at this car it's getting traded for a 4 runner .. HELP..

Formula96

hmm, lt4 knock module?

jasonp31

Injectors, gas, ignition coil, or ICM.

WhyHelloOfficer

iTrader: (5)

Just about every sensor has been replaced?
How about specifics?

What parts are new? What parts aren't.
Do you define 'new' as in borrowed from another car, or new out of a sealed AC Delco box?
Did you assemble the motor yourself? Has it been tuned?

There are quite a few options as to what can cause it. We need more information to really be able to help you trouble shoot.

BsGreenZ

the motor was put together by a shop, not sure on what sensors he has replaced i just know that he said pretty much all of them have been and they are all brand new from the dealer, it has been tuned like it says above.. i'm thinking about trying the injectors from my car on his but what alse can cause it to just miss fire under a load..