90 5.0 Erratic Idle When In Gear

90FoXbOdY5.0

New Member
Aug 28, 2012
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Hey guys, I just bought my first foxbody a few weeks ago its a 1990 gt 5.0 with a 5 speed, and recently it has seemed like it had a little miss in it at idle. A few days ago It started to jump at idle a little, but now when I put it in gear at a stop it the idle starts jumping from about 600 to almost 0 and then will die it gets so low. It looks like it has a recently replaced IAC on it I pulled the MAF sensor out and looked at it, not damaged and didn't look dirty or anything. Before I go troubleshooting a bunch of stuff, just wondering if anybody might have had the same Problem and know what it could be and save me some time. Thanks in advance!
 
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See the "Surging Idle Checklist” for help with all your idle/stall problems. You can guess at the problem and throw parts at it, or you can use the checklist to help you find the problem quickly and inexpensively. The checklist is right here in the Stangnet 5.0 Tech forum and you don’t have navigate to some other unknown web site. It‘s free and doesn’t cost anything: at last count there were more than 103,000 visits and still climbing

The quick and easy way to dump the codes is in there too, and all you need to do it is a paper clip! The first two posts contain all the fixes & updates. At last count there were 24 possible causes and fixes for surging idle/stall problems. I continue to update it as more people post fixes or ask questions.