I just finished replacing my heater core(and a vaccum line I broke) and I went to test driver the car and now it stalls and runs very rough under load. I assume I bumped something while I was working under the engine but I have no idea what...check engine light didn't come on.

 

Which car is this on, the firebird or maro? What engine is it? Carbed, TPI, TBI? Could you have maybe unplugged something for the ignition or timing? Or possibly a vacuum leak?

 

It is on the Camaro, running the stock 305 TBI. I broke one of vaccum lines, the one that runs from some sort of sensor to the back of the throttle body, but I got a new housing and reconnected it. I am going to go back out now that there is a lot of light out and see if anything looks out of place.