1996 Plymouth Voyager engin will not stay ruing

I have replace the timing belt, the map sensor the air temp sensor the o2 sensor are new the cat is new too
the thermostat, water pump, the spark plugs, check the spark plugs wires, the last time I check for codes it say it was the map sensor. The engine will start but will the idle is rough like is missing then it quite if I run it pass 1500 rpm it stay ruinnig when I let go back to idle it quits can you help me tanks