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a few months ago my 92 940 starting jerking when i would accelerate from a dead stop. then as time went by it started douing every time i let off the gas. i have tried to fix it but cant figure it out. I was messing around with the FPR and noticed that when i take the FPR or injectors out and the put them back in and releive the fuel pressure the car runs like it is brand new for about 10 minutes. so far i have replaced the CAT, MAP sensor, Throttle Position Sensor, o2 sensor, distributor cap and rotor, plugs and wires and FPR. does anybody have any idea why the car is doing this.
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