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Rough idle

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I have a 92 Comanche big ton with a 4.0 6 cylinder. I have been chasing a problem with it idling rough, it started last year with it starting hard and then a rough idle and it would just randomly shut off sitting at a light. New parts- fuel pump last year, map sensor, tps, iac, fuel filter, cps, o2 sensor.

tested fuel pressure 32psi at idle and jumps to 40psi when the vacuums line is removed from the pressure regulator. 


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