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Buick LeSabre Questions

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My 2004 LeSabre stalls while driving or while in park. It is most likely to stall when going less than 30mph. It also idles very roughly while in park and is sometimes stalls when shifting between park, reverse, and drive.

This problem gets worse after I drive the car a couple of miles and try to start it again within a 2 and 1/2 hour time frame. During this time it is near impossible to shift between park, drive, and reverse.

After searching online, it sounded like I had a sensor problem so I tried the following repairs:

***map sensor replacement
***mass airflow sensor replacement
***PCM replacement
***crankshaft censor replacement

None of these repairs helped :(

Important Note: The gauge cluster RPM reads, but when hooked up to a scanner, the RPMs can't be read from a scanner even with a NEW computer.

We think it might be a broken wire somewhere, but we don't know where.

Any help would be appreciated.

Thanks!
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