2.0 Zetec. Just replaced plugs and wires to clear a misfire code. The weird idle started maybe 500mi after that. It will drop down to about 600rpm surge up to 800-900, then repeat as long as it's at idle. Does this cold or warm. Very occasionally will drop low enough to die. I bumped the idle up with the set screw just to keep it from dying, now I have a P1506 CEL for "idle higher than desired," which I obviously caused. But that's the only code in the system.
Any thoughts?
Check in this order:
Leak in intake after the MAF (Typically the clamp holding the Intake tube to the throttle body)
DPFE sensor
Idle Air Contol Valve (IACV)
Thanks, Hal. I'll check that out in the morning and report back.
My '01 does the same thing.....But I won't put any money into it, so I haven't cared.
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