Asked by Jan 07, 2016 at 02:51 PM about the 1989 Ford F-250

Question type: Maintenance & Repair

My 1989 Ford f250 5.8 351 won't stay on when
idle. It's also missing a bit.what could it be?

3 Answers


Sounds like you could use a tune up.


bad IAC valve for the run at idle

Mine had that issue. It would not idle at all!! Same year, model, and engine. I cleaned the IAC and I was still having issues. It turned out to be a bad TPS sensor. Idles great now.

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