I have a 02 convertible Mustang GT. Well these has gone on for 3 days, it idles really low maybe 500rpm when I put it in drive or reverse, it trys to turn off but when I step on the gas rpm goes up like normal and then when I come to a dead stop it does it again. I've changed my Fuel Filter, Air Filter, and TPS, I also cleaned my Idle Air Control. What could it be? It idles good in park and neutral.

 

You might have better luck in the tech section...

https://mustangforums.com/forum/4-6l...lar-mustang-7/