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I know on some of the Fords (I know, not same vehicle), that the ECM is programmed to hold the rpms up when shifting (manual trans) . It will also increase the rpms while coasting in neutral.
For example, we were waiting in a long line of cars trying to get over the Hoover Damn. We were facing down hill, so I just put the car in neutral (wasn't going to turn it off, was way too hot) and just used the brakes to let us go forward. At about 15 mph the ecm had the rpms at almost 2000. If I stepped on the clutch they would come down.
I asked a few people about reprogramming the ecm to get rid of that feature and to get rid of the RPM hang is has when we are shifting, but haven't gotten any farther into it. I just hold the clutch in when I'm doing my coasting in that vehicle.
~Mark
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