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2002 Mustang GT idle issue

1653 Views 4 Replies 4 Participants Last post by  brannonroushII
I have a 2002 Mustang GT 5 speed. Yesterday when I was driving at about 55 mph I put it into neutral just to coast. My car just surged down in rpms and stalled. It started right back up with no problem in the turning lane. Today, I took it to test it out and see how it was running. It never stalled on me, but when I get up to higher speeds (around 50-70 mph) and put it in neutral, my rpms will drop down around 500 to 400 and move up and down very strangely. It only happens at higher speeds. Can anyone explain this?
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More than likely it's the IAC.
Why do you need to accelerate to high speeds and then put the car in neutral? Does it idle fine when you just let it idle? At zero mph?
+1, are you putting it in nuetral to coast down hills or something? How does it act normal at those speeds?
Maybe IAC but i would think it would have idling issues sitting idle too.
I drop it into neutral to coast down our long roads with hills. Saving gas haha.
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