Starts hard stalls easy!

The Vehicle: 1990 Cherokee 242 inl 6 cyl, 4x4, MFI, auto tranny.
The Problem: The Jeep it a trick to start hot or cold starter cranks fine but the motor just doesn't want to turn over and idle. It also stalls through acceleration once its running. It seems to have a dead spot in the gas pedal.
I just did a tune up on it with new battery, plugs, wires, cap, rotor, and filters. So what is the deal? Bad sensor somewhere? What are the common caused for this problem...?!?I'm lost.

Sounds like a possibly bad EGR valve like a friend of mine had though I don't know if he had a cold start problem. Everything else sounds the same.