Rep Power: 0

The problem I am having is I can start it in the mornings or after it has been sitting for a while. But it will not start on short trips.
I have replaced already plugs,wires, distributor,coil,both oxygen sensors,main relay,fuel pump ,fuel filter, and now it it giving me codes P0118 and P1381
Got any suggestions ? I was told neither one of those codes are the problem.
New problem now when idling ac will stall engine.

 
Rep Power: 235

P1381- cylinder position sensor. It should be in the housing of the distributor, check for good connections at the distributor.