i have a 92 hatch and i put a 95 ls swap in my car today and i started it and the engine revs real high and the drops down then does it again.... please help i need my car

 

check vaccum hoses, and all sensors to make sure none of that is throwing your engine off.

 

yeah and make sure you have coolent and no air bubbles in the coolent aqueese the hoses

 

yeah check your vacuum hoses especially by the brake booster..

 

i checked the vacumm hoses and the sensors but i looked at the intake manifold and it looks like the person that had the motor changed it and i took it off and there was 2 gaskets on there but they were messed up do u think that might be the cause

 

thanks

 

2 intake manifold gaskets? definitely could be the cause of vacuum leak.

 

oh ok thanks