My engine speed goes up and down in park after car is warmed up. Put it in drive it sometime dies
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1992 Ford Taurus Question: Engin speed varies
Answer #1misterjaybird January 18, 2009, 18:39Rookie
My wife and I have a 2.5 that had the same problem. For us, we had to replace the IAC valve (Idle Air Control Valve). It ran with very low idle, and nearly stalled when put in drive. It cost us $50 to $60 and replacing required two bolts and unhooking the wires.First, have the codes read, then go from there.If you have a returnless fuel system, have the fuel pressure sensor checked out.