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RPM unexpected movement

Electrical and Electronic

Vehicle Information: Model: 1990 964 C2; Year: 1990; Body Type: Coupe; Engine (type, size, modifications): 3.6; Total Mileage: 73000;

RPM unexpected movement when running, up to 1000 rpm ahead, and when maintaining 3000 rpm the car look s to go slightly forward and back again, I already change the DME, and the problem still appear from time to time, not usually. I also have a problem with the door locks, it doesnt work when stopping the car the door locks is death, the entry key is flat on both sides, and I had to enter in the car close the door, switch on the start key move it in to the starter position, and my surprise, is there is no test lights and the rest of the normal ignitions lights on the gauges, the cars start normally when the key is rotate, then I push the power door lock button in the center console, the doors lock, then push it again, the doors opened, and every thing works perfect again , close the doors and the key works again closing the car in both sides. I change the pilot door actuator, and the wire that goes from the key to the actuator, the problem persist. This is driving me crazy!Many thank Miguel Villotaf.

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