I have a 91 Dodge Spirit, When I first start it and drive it as I come to a stop the Check Engine light comes on and it Idles very low, From that point on upon acceleration It runs great but when I try to maintain a steady speed the Car Jerks. I have ran the self diognastic and I get 3 Codes
1. 12- Battery been disconnected within last 50 keyon cycles
2. 13- No difference recognized between the engine map reading and the barometric
(atmospheric) pressure reading from start up.
3. 55 Completion of fault code display on check engine lamp.

I have replaced the O2 sensor, Map sensor, Fuel pressure regulator and Fuel injector.

I would appreciate any help anyone could offer

[email protected]

. Reset ECM.
. Adjust idle rpm to specs. Ensure Throttle Position Sensor (TPS) works properly.
. Ensure spark plugs, spark plug wires, distributor cap, rotor, coil and Ignition Control Module, if any, are in good shape. AutoZone can test ICMs and coils for free.