I had my transmission flushed about two months ago. Since then my car runs at higher RPM’s at 70 mph (about 2600 RPM) and my mileage is down almost three mpg.

1988 Ford Taurus 3.8 V6, auto with OD. The engine almost always runs without issues when driving, or when stopped with the transmission in drive or reverse. The second the transmission is shifted into neutral or park, the engine increases in RPM’s and then drops off. This cycle usually continues until the engine stops running. Sometimes it recovers and idles for a few seconds, then returns to the fluctuating RPM situation. With the transmission in park or neutral, the RPM’s fluctuate, if you put the transmission in reverse or drive, the engine usually recovers and runs at a steady continuous RPM. If the trany is shifted back into neutral or park, the RPM fluctuation starts all over again. This issue has mostly if not always occurred when the engine is at its normal operating temp. There have only been a few time this occurred with the transmission in drive. Does anyone have any suggestions or experience with this type of issue?

I have a Ford Taurus 2008 Sel, 41K miles on it.

When it is in the parking or braking mode, the engine’s RPM fluctuate between 0.5 - 0.7 (500 - 700 RPM). Cold start RPM is about 1500.

Is the fluctuation within the normal range? The fluctuation stops when I drive it.

I got since one week a 2005 Ford Taurus.When i start my engine the rpm idles very high.When i try to put the rear gear then it shifts very hard into it with a noise.After the engine gets hot everything works fine in the tranny its just when i coldstart the engine.

I have a Ford Taurus 2008 Sel, 41K miles on it.

When it is in the parking or braking mode, the engine's RPM fluctuate between 0.5 - 0.7 (500 - 700 RPM). Cold start RPM is about 1500.

Is the fluctuation within the normal range? The fluctuation stops when I drive it.