1989 ford f-150 wont stay running?

Asked by 1989fordlariat Sep 14, 2016 at 12:23 PM about the 1989 Ford F-150

Question type: Maintenance & Repair

My truck is running and idling REALLY rough. Every time I start the engine,
it will turn over but then it reves into the high 2000's for RPS's and then
drops to nothing and dies. If I want to keep it running, then I have to give it
gas to imitate an idle. And I have to slip it into drive or reverse immidatly,
otherwise it will die. I just want to know how to start trouble shooting the
problem. Can anyone help me out?

5 Answers
35,335

lrodri911 answered 8 years ago

Check fuel pressure. If fuel is ok, check crankshaft positioning and throttle positioning sensor. Other things that can cause that particular problem is evaporative solenoid stuck open

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4,410

Up answered 8 years ago

Looking into idle air control valve problem and check for vacuum leaks

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690

Jesse answered 8 years ago

Check the hose going to the MAF adaptor for holes, oxygen sensors, Idle air control valve, take a can of starter fluid while it is running and spray around the throttle body, all hoses and vacuum lines. if it revs up, you found the vacuum leak.

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