I have a 2001 vr6 auto...reverse works fine on initial start up, and after that only if you give the car over 2500 rpms...and after warm up it will either shift extremly soft from 2-3 and the. Again from 3-4. Or it will shift almost like its hitting max hydrolic pressure in the same gears...it also occassionally over revs...scanned at aamco and they said its nothing electronic...can anyone give me a good cheap starting point?