Question about 1999 Ford Expedition

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New plugs, new fuel filter, all coil packs and injectors check good with the olms test. Starts good and idles good at first then stalls or idles very low rpm. On the highway it has great pick up but as I slow down it stalls. Its at it's best at 65 mph. Better gas mileage now but still has a miss too.

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  • Anonymous Mar 30, 2014

    does not want to seem to pick up fuel when driving

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You have a vacume leak explains all symptoms runs leaner better gas milage listen for hiss look for cracked or broken vac lines

Posted on Jun 21, 2009

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SOURCE: engine stalls

The throttle position sensor has a small amount of adjustment in it. The plastic case has a slight slot in it. On the opposite side of the TPS on the air horn you will see a throttle stop with a hard to move screw. You need to get some play on that screw to have slack to adjust the TPS. I think it was good for 100+rpm at base idle.
This may help you, but check you EGR for diaphram and carbon buildup.

Posted on Jun 28, 2009

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The throttle position sensor has a small amount of adjustment in it. The plastic case has a slight slot in it. On the opposite side of the TPS on the air horn you will see a throttle stop with a hard to move screw. You need to get some play on that screw to have slack to adjust the TPS. I think it was good for 100+rpm at base idle.
This may help you, but check you EGR for diaphram and carbon buildup.

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