1) I guess it's a 1994 or 1995 DI given the two digit codes.
2) The TPS seldom, if ever, affects the engine at idle. It usually show itself with a flat or dead spot at higher rpms. Thus, changing the TPS was never going to get you the desired results.
3) Listen to jhmover and clean your stepper motor or IACV as some may call it. You can even replace the stepper motor with a new one from Auto Zone for less than $40. Request an IACV from a late 1980's Chevy Astro Van.
4) It wouldn't hurt and could help to remove the IACV housing (the part the the IACV screws into). It probably needs a good cleaning as much as the IACV does.
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