My mechanic has been stumped for several months on the continued idling issues, surging, stumbling and quitting on my 1984 Mustang Convertible with the 3.8 V6. He diagnosed and replaced parts until he finally just had to quit for awhile. He is not a mechanic that just changes parts and he is great at diagnosing issues that are hard to figure out. I have been researching the net relentlessly and ran up on an old Ford repair bulletin from days gone by. It described my problem (occuring only after the engine was hot) to a tee. It stated the culprit was likely the spacer under the throttle body. When the original spacer gets hot it shrinks causing a vacuum leak that causes all the idling issues. It specifically said to remove the stock spacer, part # E4AE-9C477-BA and replace it with a new fix, part # E6SZ-9C477-A. I ordered the new part off Ebay for less than $15 and installed it as soon as I got it...all the idling issues are solved. The old part was definitely causing the problems. I'm back on the road again! Hope this helps someone!
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