Dat-94'Z28

motor came from a 93 trans am but i have my 1994 intake and exhaust on the engine everything is completely stock besides the cold air intake

4th Gen 4 Life

Why make another thread? Did you even try some of the suggestions?

Also did your wiring harness match up correctly? I might suggest you looking at the detailed specs of the pcm difference of the 93 and 94 fbody.

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Dat-94'Z28

i tried everything that was suggested and it still doing the same thing i have the firing order correct with the plug wires it even did it before i changed them also but one thing i did do while the motor was out and i was changing the valve covers from one motor to the other is i did tighten all of the push rods without the knowledge on how to do it could that be a possibility on why this car is acting like the timing is out of whack i have no knowledge on how to do valve adjustments on here i just saw there were some pushrods loose so i tightened them all till there was no play in any of them and i think that might be where i screwed up

Injuneer

Did you place each cylinder at TDC before adjusting the rockers for that cylinder - see Shoebox's procedure?

4th Gen LT1 F-body Tech Articles

Dat-94'Z28

I do believe this is the exact problem i am having with the car is struggles to start but one it does it has a hissing noise that sounds like a vacuum leak somewhere but i sprayed every hose on the car with brake cleaner and it noise never went away so could that vacuum leak sound be coming from the intake valves not closing all the way??????? And could that be the reason it runs like it does

Injuneer

The hiss isn't a vacuum leak. Its probably the compression escaping from the cylinder through an intake valve that isn't fully closed.

Dat-94'Z28

thanks a million man you are a lot of help with anything i need help with i always know i can count on anyone on this site to help me out