You said the Mixtures go rich.. I'd look there.. What Tune/Prom are you running.. I was doing some NA Prom work on my NA '90.. similar symptoms.. End up it was self inflicted.. I had increased the K Value and Injector Latency trying to Stabilize an Idle SMOG issue, but ended up making it Stumble if the throttle was opened, then closed quickly.. When I was Feathering it during clutch engagement.. Light weight Flywheel on this NA.. Presently I have not found the Throttle enrichment table.. so I put my Values back and that problem went away.. The Org problem was I was trying to get the ECU to Idle at Stoch.. with an O2 Sensor Hunt.. It really does not like to do that.. At least in a 'Stable' Oscillation.. I will approach that problem in a different way.. Cj
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