I have a 1990 devile with a 4.5 engine,recently its idling very rough.I changed the rotor and dist.cap and the plugs were repalced last year.Also when stopped at red light sometimes the engine will rev up and down in its own without my foot on the pedal like its possessed....after about 20 seconds it will steady out.ANY COMMENTS OR SUGGESTIONS WILL BE VERY APPRIECIATED...reply here or email pzkeys@msn.com Thank you kindly,
Pauli

I have a 1990 devile with a 4.5 engine,recently its idling very rough.I changed the rotor and dist.cap and the plugs were repalced last year.Also when stopped at red light sometimes the engine will rev up and down in its own without my foot on the pedal like its possessed....after about 20 seconds it will steady out.ANY COMMENTS OR SUGGESTIONS WILL BE VERY APPRIECIATED...reply here or email pzkeys@msn.com Thank you kindly,
Pauli




Go to the search feature in the forum toolbar and type "Fuel Pressure Regulator" in the drop down box and read my posts. Also type in "idle speed control motor" and "closed throttle switch" and read up.... I think your question should be answered there.