Firing at stop light idles rough

Asked by Robert Mar 24, 2023 at 04:14 AM about the 1991 Ford F-250 2 Dr STD 4WD Standard Cab LB

Question type: Maintenance & Repair

When I come to a stop it won’t stay

idling it dies or dies apon take off and

there’s a rattle from the engine I think

and bogs down it’s f250 460 7.5 with

288000 miles on it

1 Answer
155,195

james answered about a year ago

Sounds like a bad knock sensor that's severely retarding the ignition timing. Do you have a valve tap? If so the knock sensor might be hearing the tap, sending a signal to the computer, and retarding the ignition timing. If the engine is lacking power and running hotter than normal too that would be my first suspect. Hope that helps! Jim

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