Hello. I have weird problem with my CA18DET factory ECU, My engine came from factory with automatic gearbox but now I have manual gearbox and engine Ecu for manual gearbox. But I have tryed 3 different ECUs but all of them have weard problems. All ECUs are 2371-39FF00 Ecu one: when RPMs are troping they are stopping on idle for a second, then dropping to 500 and up to ide again. Ecu two: Same as ecu one but do not rise idle RPMs from 850, disconnect aac and reconnect, worked as ecu one. Ecu three: worked fine until I tested spark plugs and now when I turn off the ignition switch nothing is happening, until I unplug ECU relay. I think I burned something in ecu. I have deleted all things what can mess up idling except aac valve. I have cleaned and replaced aac valve many times. If it helps I can make video from 3 different ecu... My question: Why is those CA18DET factory ecus so problematic when dropind to idling? Is there some components what are failind becaus they are quite old?