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Simple, in D or any other forward or reverse gear you are putting a load on the engine by activating the transmission. N or p are neutral gears that put no load on the engine and that is why you can take your foot off the brake in either one. The question is what is the normal idle rpm of your vehicle? If it is out of range then it must be adjusted.
The normal idle RPM of Neon is 1000. It just went up to 1500 when I stop at the red light yesterday. It was 1500 rpm on both N and P. It's never been like this. I think something is wrong.

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Q: My 1996 Neon 3-speed auto transmission RPM shift from 1000 to 1500 when idle N or P. But if I change from N to D or P to D RPM is back to 1000. Anyone know what's wrong?
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