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Re: TPS adjustment oddity
The curb idle TPS voltage relies on the throttle shaft position being very repeatable. It is important to verify that the high idle cam on the right side of the carb is fully clearing the high idle adjustment screw when the choke is open. This will assure that the curb idle adjustment screw is controlling the throttle shaft position and NOT the high idle screw.
It is also critical that the throttle shaft is not wandering in the throttle body. I'd bet a nickel that the throttle shaft bushings are worn and the throttle position is not repeatable due to the throttle plates guiding the shaft to different positions every time the throttle closes.
You should also inspect the pivot arm, pivot pin, and linkage rod for the accelerator pump arm for wear and looseness.
Personally, I would agree that it is worthwhile to maintain the E4ME and not revert to the fully mechanical carb. Removing the E4ME and doing it properly would require a new distributor, a new scheme for converter lockup control, and new EGR control method.
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