Have them spray (lightly) starting fluid around the intake with the truck running. If there is a leak the engine will idle up even more. They may also just need to adjust the throttle linkage.
SOURCE: chech eng light on, idles funny, stalls when stop
Vacum leak,look at the hose going to the pcv valve first- that was the problem on mine.
SOURCE: 2000 Ford Explorerer rough idle When cold
what codes are present? If it is lean codes P0171/P0174 problem is most likely the orings leaking between upper and lower intake manifold if this is a 4.0L
SOURCE: Just changed battery. Check engine light comes on
you need a scanner to see the code for whats wrong,unhooking the battery for 15 or 20 secs will reset it to
SOURCE: check engine light is on: engine idles rough
IT SOUNDS LIKE THE IAC (IDLE AIR CONTROL) MOTOR IS BAD OR GOING BAD, BUT THE QUICK SOLUTION IS GO TO ANY AUTO ZONE,OR ADVANCE AUTO PARTS STORE, AND THEY WILL CHECK IT FOR FREE,& TELL YOU WHAT SIGNAL CODE MADE THE CHECK ENGINE LIGHT COME ON, I WOULD DO THAT JUST TO BE FOR SURE, BECAUSE THERE ARE A FEW OTHER THINGS THAT CAN CAUSE IT AS WELL,SUCH AS MAF SENSOR DIRTY,OXY SENSOR GETTING A BAD READING,ETC.
SOURCE: check engine light on running very rough
go to autozone for a free computer scan and get the fault code. Possibly one of the COPS, Coil on Plug. COde will tell you
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A couple friends suggested the vacuum system, as did one of the replies below and one of them worked on it. I am not sure what he did but it runs better. He thinks it is still something with the vacuum. This is the older 7.5L; 460 cu in gas.. I think it has a throttle-body fuel system. The truck is 600 miles away and I can't look at it myself.
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