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The truck idles poorly and often dies in park or neutral. I did a complete tune up but still the same thing. I think it is either Throttle Position Sensor or Idle Air Control motor.
I tried to pull the codes to tell definitively before replacing parts but cannot get it to work just yet.
Question is, how often does TPS go bad? Is it more likely to go bad than IAC? Should I replace both? Should the throttle body be cleaned with carb cleaner?
1989 F250, 460cid, C6, 85,000 miles