1999 Plymouth Voyager high idle when in park or neutral

1999 PLYMOUTH VOYAGER
160,000 MILES • 6 CYL • 2WD • AUTOMATIC
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1999 Plymouth Voyager mileage: 160,000. The Rpm's rise to 2000 when my car is in park or neutral. This just recently started happening. It usually idles just above 1000. When I put it in any gear without giving gas it drops back to the normal 1 position. We had the timing chain replaced about a month ago, but it was running fine until this week.
Oct 28, 2010 at 7:08 PM
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Answer: Your car may be ready for a major tune-up including spark plugs, plug wires, distributor cap, rotor, fuel filter and air filter. Also, perform a fuel pump pressure test. Clean fuel injection system including throttle bore, idle speed control motor and passages. If problem still exists, scan computer for trouble codes.

Oct 28, 2010 at 7:17 PM