I just finish replacing a 3.4 in a 94 the motor will start but will only run for about 10 seconds if that long, I would like some idea before i start to dug in to this car again. When it is running it sound ok no missing or backfiring I think it may be in the fuel system just a guess right now What do you all think

 

We might need a little more info/history. You replaced the engine? what did it have before? why the replacement?

Could be fuel pressure or a vacume leak. without more info thats all I can come up with.

 

https://camaroforums.com/forum/93-02-v6-tech-14/blown-head-gasket-34375/ this why I replaced the motor 3.4 to 3.4 both 94 I replaced all gaskets and valve seals

 

could be bad fuel pressure, clogged inectors or as mentioned above, vaccum leaks. more info?