1998 Dodge Durango Question: after warming up i sputter and surge when i accelerate or turn the heat on

I replaced the pcm and resolved a whole mess of problematic symtoms,,,now my check engine light is on again and after my durango warms up the rpm will sputter and surge within a 100-150 rpm radius....when i turn on the heater or defroster it will kill my engine 3/4 of the time and when i try to drive her around the block she sputters and surges when I accelerate and dies 9/10 of the time,,,,,she is heating up more quickly but not overheating because I just turn her off...there is no water in the oil but napa said it could be my head gasket,,,,,but isn't this more of an egr symptom....i cannot take her to napa to get her tested because she won't make it up my small hill,,,,and for a durango my hill should be a mesquito bite sneeze,,,i love my hemi but she is nickel and diming me...I replace the pcm because i could here the cranshaft not line up and the engine shook and white smoke came out my tailpipe,,,those symptoms were rectified with the new pcm,,,I have also replace the water pump, the belt, the fuel pump and the plugs and plug wires since I bought her two years ago,,,also i have anal about oil changes and stuff like that