Rough Idle Question

89psychobird

Registered User
I have had a bit of a rough idle for many months now, and it's getting worse. A few months ago I installed an Art Carr trans with a 2300 stall converter. I know fuel economy should go down a little, but I am now getting about 10 mpg in the city, even if I keep my foot out of it. I changed plugs (Autolite double plats) and wires (Taylor Spiro Pro) but did not help. I have sprayed carb cleaner to find a vacuum leak, could not find one.

A few months ago I pulled codes and got EGR VALVE NOT SEATED. Would an EGR valve not seating cause a rough idle / rich fuel ratio? What else could it be? DIS, Coil Pack???
 
I'm not sure on an SC but I had a stuck egr valve on my pickup and it definetly ran like crap at idle and low rpm.You could block off you're egr at the back of you're inlet and see if the idle cleans up.

Jay
 
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