I have a 95 Z-28 the car was runnig great one day and the next day it started to struggle to run over 3000 rpm i talked to some friends who have alot of experience with lt-1 engines and they told me it was the opti so i changed it. Still no start here is a list of parts that i have changed but it still won't go

opti
spark plugs
wires
coil
i c m
fuel pump
regulator
filter

the only time it will even try to start is with the intake elbow off and throttle held wide open i also pulled the intake and resealed everything

please help

 

By filter you mean fuel filter right? Are you sure you have the wires done right?

Fuel Pressure?

 

sorry about that yes fuel filter
i have checked the wires several times to make sure i had them right