I’ve been experiencing this unstable idle during my “cold start” mornings. Idle fluctuates under 1k RPM for approximately 5-10 seconds before stabilizing. Spark plugs just replaced w/ factory spec ~75 miles ago. No codes stores in INPA. Any ideas?
Update: pulled all four VANOS valves cleaned, replaced O-rings w/ Vitons. Re-installed and ran bleeding procedure with DIS four times. Then, reset DME adaptations. Engine idle returned to normal.