1989 ford f-150 wont stay running?

Asked by 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

5,045

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

1 out of 1 people think this is helpful.
840

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

2 out of 2 people think this is helpful.
60,305

Agree with Up,air leak or idle control issue.

50

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.

Thanks for the ideas guys! I will make a check list and just start going through stuff this weekend.

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