Blakers,
I replaced the crank sensor on mine and it is still throwing the code and the tach is jumping all over the place when you really lay into the throttle, didn't ever get any response to my post. I would love to get it fixed but not sure what else to do at this point.
Good luck, and let me know what you find.
Tim
My tach also jumps all over at idle. I took mine into the dealer and put it on the Star Scanner and supposedly my PCM is toast. I also have other issues besides the tach jumping though.