hi, just bought a 1992 camaro z28. the 305 was replaced with a 350. was told engine was rebuilt, a new cam, new injectors was put in. my question is i drive the car for about 15 minutes runs great, turn off car, and then cant get it started again. i push gas pedel to floor, it starts, but when i put foot on brake to shift, it dies. after i do get it started and driving again it runs like crap. the next day it starts right up, and run good til i turn it off and try starting again. does any one have any ideas what the problem might be. thanks for your time, your help would be greatly appreciated. andy

 

Check the timing. I have had some when the timing was out it would be slow to start or not start at all when the engine was hot.

 

check the vacuum hoses , mostly the egr valve. if it get the wrong signal du to bad hose routing???
but need more info on this "runs like crap"
sounds like it floods itself some how or just gets really rich.
could be vauum leak too.
how does it run if you drive hard? after it is hard to start

 

Hopefully they put the right sized injectors in it, larger ones can sometimes cause this issue.

Also probably a stupid question, but did they install the correct ECU for the 350?

 

Got mine fixed. Turns out it was the crank sensor. Could be the ingition module too.