My 990 had the same idling sympton after a fuel stop.
My best advise for reset procedure is:
Engine should be cold, use main stand.
Air temperature should be low, early morning/late evening.
Idling should be 15 minutes without touching the throttle.
Stop engine afterwards using key.
If the engine dies during the set-up, restart it without touching ingnition key and throttle. Idling time does not start at zero again.
As long as the FI lamp is not on, the idle reset should do the job.
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