Ford Mustang Forum - View Single Post - 1999 Mustang V6 idle issue
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post #4 of (permalink) Old 01-09-2011
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Originally Posted by 99allgonoshow99 View Post
My 99 revs to about 1.5 2k right when i put it in drive or reverse drives idles normal after though sometimes it feels like its gonna stall when i stop. like if u tried to come to a stop in a 5-speed w/o hittin the cluch feels like the tourqe conv wont let go but i dont think there related. the motor is an 03 long block stock with the 99 upper intake an other acc. i also just sprung an evap/intake leak code but its been doing the revving gear thing since the swap. Thanks
One of the possible causes of slow idle especially when stopping is a lock up torque converter that is not releasing as it should.

One of the other causes of high idle is a vacuum leak after the throttle body. A leak in the intake manifold qualifies.

IMO, you should consider the possibility that the problems ARE related and the problem solution is right in your hand.

Does it have a delayed engagement in drive and reverse? What is the condtion of the fluid?

Regarding vacuum leaks, today's cars simply will not run right with even the smallest vacuum leak. I suspect that onced fixed, there will be a world of difference.

The link below has more information about how to troubleshoot IAC problems. In your case, it doesn't make sense to perform the steps as there is a known vacuum leak.

2003 GT Convertible (sold & missed)
2000 GT coupe (Craigslist project. Fixed. Now my DD). Windsor to Romeo swap.
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