Stalling issue persistant 90` Corsica
 

Ok just picked up a quick replacement car for my other 90 corsica. It stalls out after about 15-20 of driving. When I slow the car until its in first gear, it bucks like crazy and dies. It starts right back up, but once it goes into drive it dies. Takes several tries of revving in Nuetral and going into drive before it will go again...but will die once it slows again.

I recently replaced :
Oxygen Sensor
Fuel Filter
PCV Valve
Air Filter
Spark Plugs
muffler up to the catalytic converter
map sensor (took it off my other car, was working fine and was a replacement on that one)
Oil change/Oil Filter

What else could be wrong?