1993firebird

i bought a 1993 firebird a few weeks ago it stumbles when i hit the pedal hard i changed the spark plugs wires dist cap and rotor and fuel filter was clogged when are crusing you can feel a miss but when you hit the pedal to the floor it goes no lights on in the dash this is my first lt1 car i need help

96z28_lt1

iTrader: (3)

first thing to do is put a fuel pressure gauge on the shrader valve and check fuel pressure, dont just throw parts at it, youll get frustrated and the cost will add up very quickly, also go over all plugs again make sure you have them in the right spots, make sure all connectors are hooked up
also

garage_queen

iTrader: (3)

Any mods on the car? Aftermarket throttle body?

1993firebird

engine is stock fuel pressure was low replaced the pump new did wires and plugs coil and ing module 1 new o2 sensor that a shop said was bad no check engine light on it came on last year said egr valve replaced did not help tired of throwing parts at it nobody I have talked to can not tell me whats wrong with it if u mat the gas pedal to the floor it runs good

MedicinalCreamDogs

iTrader: (4)

what brand opti was put in it to replace the old one?

1993firebird

ac delco

Paul Bell

iTrader: (9)

Does it also stumble when you have it parked, hood open and you blip the throttle?

I agree, get fuel pressure gauge on it for a look.

1993firebird

fuel pressure is good it don't stumble when I hit the throttle in park

AdsoYo

iTrader: (1)

Knock sensors acting wonky can cause these symptoms. How's the pigtail look? Should have 5v key on engine off. Shake the wire around while testing to make sure it doesn't fluctuate. Test the sensor itself for resistance. Should be 3300-4500 ohms. If that's all good, the knock module is a possibility.

1993firebird

thanks I will try that when I get some time