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Old 04-03-2019, 11:00 AM   #2
D13
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Join Date: Feb 2007
Location: Memphis MI
Posts: 1,851
Re: TBI Idle/highway trouble

Distributor worn, affecting pick up coil performance, or pick up coil and/or module going bad. Gets confused as to RPM and/or timing. Confused enough it will shut off fuel. Bad plug wires backfeeding the module caused my miss then no start issues on my 1990.

Massive vacuum leak, intake gaskets or TBI shaft although that usually is less sensitive to high throttle.

IAC stuck but again less sensitive to high throttle.

There ought to be TBI diagnostics floating around here somewhere...
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1987 2 ton
1982 250/TH350 beater in progress
Dad's 1981 3/4 L6 3 on tree posi and no options, awaiting restoration or scrapping
Plus a mess o' tractors
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