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Thanks...Jimmy...for your reply.
I couldn't find a vacuum leak in spraying starting fluid.
The engine does NOT knock or ping...it
just misses when floating at 30 plus MPH....pretty smooth on acceleration & deceleration.
On second test of codes, I got a code 34, EGR valve positions sensor...but I now noticed this test was to be done with engine running, which I did not do. Anyway, I put another working/good EGR position sensor on '91 GM and this did NOT solve the missing problem.
You mentioned the IAC valve. Is there a way I can check this on or off the vehicle?? I see Ford has two(2) listed: CX-1823($58.79) and CX-1824($63.79).
Could a sticking/faulty Canister Purge Valve be at fault??
Parts list shows four(4) Purge Valves connected to one wiring harness & connector.
Take care.
Art Gladfelter
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