On the inlet manifold there is a black plug with 3 lines, 1 to fuel pressure regulater, 1 to map sensor and a spare for god knows what. Make sure their not leaking at all otherwise your map sensor sends the wrong signal to the ecu.
Also check to see if the tps isnt out of wack, and check timing, make sure the dizzy isnt a couple of teeth out.
These are a few of the dramas i had with my motor a little while back.