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2006 Pacifica engine issue

I noticed that someone had previously came here with the same issue that I had but I did not see any response to the issue they asked about.

I drive a 2006 Pacifica and lately the engine has been causing me some grief. When I am in park, neutral, or in gear but stopped, the engine will sometimes rev up and my speedometer will jump accordingly sometimes as high as 30 mph. My first thought was that it might be a transmission issue, but I’m not a car mechanic so I don’t know much along the lines of what to check or do. The model is an automatic 3.5L

The speedometer is registering 30 mph but in fact you aren’t moving at all? hmmm … some kind of problem with the vehicle speed sensor I’d guess. That could also cause other drivability problems. Suggest to start with that.