any help will do
 

I've got this 99 ranger with the 3.0 and she stumbles just a bit off idle. In fact the idle isn't exactly smooth but it's acceptable. It's when I step on the gas that she stumbles briefly and then comes on OK. This event happens in & out of gear. I've changed the plugs to the motorcraft fire wire, bosch performance wires.I took the truck to a friends shop and he hooked up an assortment of dianostic tool that basicly indicated that there wasn't a problem. (no codes) We cleaned the MAF TPS throdle body & I run about 3 oz. of lucas fuel injector cleaner in a tank a couple times a month.Oh yea , it;s more noticeable when warm but if I shut it off for a few( 10 to 15 min) & fire her back up she runs on all cylinders for a bit, then it,s back to the stumbling*** Any help will be appreciated

Re: any help will do
 

Clean your IAC, strange it isnt throwing a code? How long has this probelm been happening? recent?

Re: any help will do
 

About 6 mos but more noticeably lately IAC?

Re: any help will do
 

Idle air control valve. looks like this

http://img204.imageshack.us/img204/1492/photorc.jpg

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and its on your throttle body.

Re: any help will do
 

I,ll give it a shot of carb cleaner in the morning be fore I head out to work

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NOO! it needs electrical contact cleaner. Such as MAF cleaner.

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I,m just a shade tree mech. who,s trying to save a few cents thanks

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You will ruin the sensor thats in it. Youll melt it, thats what carb cleaner does. If you dont have elecrical contact cleaner dont even bother with it.

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Kinda seems like what my truck's been doing for awhile. But mine gets real severe after a little bit of driving. Unfortunately I don't have a fix for it yet.

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Know that when I find one I'll be bragen bout it ,actually shareing what worked for me fit s better