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To clarify what I did was change out the long block! The long block came from an Accord EX that had a production date 6 months post the date of the Accord EX in which it was installed. The same engine family, F23A4, ULEVVTEC, Hollander interchange number of 80123C.

Thank you. If there is am adjustment screw were would I look? Is this adjustment set at the factory? As far as a vacuum leak how should I go about locating the leak? I don't have much experience in diagnosing engine problems. I will see if I can find out if the car has the FITV.

I have a 1996 Honda Civic Cx with 550,000 miles on original engine. The engine is a D16Y7 (1.5). No cel, not burning oil, Manual Trans, original clutch. When car is cold car idles perfectly. When car reaches N.O.T. and cold start system is inactive the engine fluctuates from 1000 to 2500...