2001 ranger off idle

2001 FORD RANGER
74,000 MILES
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DEREK97116
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I have a 2001 ranger 4.0 liter v6 auto It has a low idle in gear like 500 and engine acts like its got a vaccum leak but got it checked and no leaks and I changed the maf sensor pcv valve plugs and wires tps sensor and iac valve and still does it its not to the point where it dies but you can tell it doesent idle right what else could it be it did pass emmissions testing
Jan 23, 2012 at 2:30 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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ASEMASTER6371
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stop throwing useless parts at it.

did it have any codes?? when you start it up, does it idle up fast and then come down low?? did you adjust the base idle when you did the iac valve??

Roy
Jan 23, 2012 at 2:38 AM
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DEREK97116
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It does go high like 1200 then goes down to 500 and I have tried adjusting the set screw a tad but that dident help and no all I did was swap the iac valves and disconnect the battery
Jan 23, 2012 at 2:42 AM
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ASEMASTER6371
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then the iac is working. it sounds like the throttle or the base idle has to adjusted. with the iac disconnected, the idle should be 550 rpm.

Roy
Jan 23, 2012 at 3:17 AM
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DEREK97116
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How do you adjust the base idle
Jan 23, 2012 at 3:40 AM