2000 Ford Ranger engine almost stalls

2000 FORD RANGER
80,000 MILES • 6 CYL • 2WD • AUTOMATIC
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MTGRIFFIN
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When sitting idle for a couple of minutes, the engine seems to either go into a very low idle to the point the engine almost stalls. It starts jumping around similar to as if it was missing. It started a couple of months ago and during this time some days are really bad and others I don’t experience it problem.

Replaced fuel pump, fuel filter and IAC the first time I brought it in shop about a month ago. The same shop has had it for four days this week and they have not been able to isolate the root cause of the problem.
Oct 9, 2009 at 3:03 PM
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JACOBANDNICKOLAS
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Has the check engine light come on? Have they tested the throttle position sensor? Vacuum leaks?
Oct 28, 2009 at 8:17 AM
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MTGRIFFIN
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The check engine light has never come on. I'm not sure if they have tested the throttle position sensor or for vacuum leaks.

Since my last post, I replaced the plugs and wires and still had the same problem.

The shop replaced both of the oxygen sensors and that seems make things a lot better. It is not running perfectly and although I have not experienced the same degree of the problem the engine does hint that there is still an underlining problem.

Now I have a new problem that started the day I turned it in the shop last time. About half of the time I try to start the truck, it cranks but does not start. I have to waiting a few minutes and try again.
Nov 2, 2009 at 2:57 PM
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JACOBANDNICKOLAS
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For the original problem, I would recommend checking for vacuum leaks. As far as the new one, it sounds like it could be the electronic engine control (EEC) relay. When this happens, I need you to listen to see if you hear the fuel pump run for a second when you first turn on the key. Also, if possible, check to see if there is spark to the plugs. If you need directions, let me know.

Joe
Nov 2, 2009 at 7:07 PM
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