After the engine warms up the idle speed will surge when put in neutral or park. I had this diagnosed and fixed a year ago. The TPS was replaced. Even after the TPS was replaced the car seems to hold it's current idle speed when in drive. I'm talking coasting a 1/2 mile with foot off the gas and not losing any speed. About 6 weeks ago the initial problem came back. Is there something else, in addition to, the TPS that should be looked at? Thx
What causes idle speed to increase in neutral? on 1998 Ford Taurus
by Skyhawk21 in Peoria, AZ on September 14, 2009
ANSWER by Valleyautotech , February 11, 2010
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