My bet would be on the IACV vacuum line having a small leak -- not enough to make it run bad but enough to throw off the air fuel ratio slightly. If you have a multimeter I'd also recommend measuring the duty cycle. Chasing down fuel ratio issues on these cars are kind of a pain but in my experience it is old dried vacuum lines/connectors 90% of the time.


Sent from an abacus

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth