i got an 88 firebird with a 5.3 vortec. its idling very low at 300rpm and when i give it throttle to get the rpms up it stalls and shuts down. ive already have changed out the tps, iac valve, and the crankshaft position sensor. ive also change out the intake manifold since i found out it had a crack close to the map sensor. my fuel pressure is reading at 60-58psi so i doubt itll be the fuel pressure. it has open headers for now. i hooked up the scanner and it still read ckp system variation not learned after changing the crankshaft position sensor. any suggestions? thanks

 

Get a full exhaust on it before you start throwing more money at it, or at least pipes to get the exhaust away from the O2 sensors farther

 

I put on the pipes that lead to the y pipe and it seems like it wasnt idling as bad as it was before. But it still stalls when i give it throttle

 

Is the engine stock? Did you use the correct crank sensor?