Check the fuel psi, should be 49psi at the test port. What brand of fuel pump was it?
Has a comp test been done? Timing marks lined up and checked? Injectors cleaned?

 

Got mine straightened out. It was a stopped up cat and a bad pre-cat O2 sensor(white).

 

ok, so the O2 sensor being unplugged didn't work. stalls after sitting in drive and trying to take off.. when the engine is cold.or warm gets erratic idle in park and in drive, i try to take off and it sputters and i can hear it crap out (air threw the air cleaner). If i hold my foot on the gas at about 1000 rpm and hold the brake in drive, i can take off better.. once it craps out and dies.. i have to put it in neutral, hold the pedal to the floor, crank it until it starts up and clears itself out , will idle fine for about 10 sec then start to idle erratic again.I checked timing (OK) I changed pickup coil (No effect) Changed dist. Cap and rotor (No Effect)

 

Sounds like the TPS or IAC needs replaced?

 

Or possibly the coolant temp sensor is lying to the PCM...... Wouldn't hurt to plug in, and watch various sensors, and see what they are doing when it starts screwing up.