My RPM's are speeding up. The engine revs but car doesn't speed up. Whats wrong on 2000 Mercury Mystique

The car jerks when the rpms go back down. Computer says erg valve or transmission range censor is bad which is it? How do I fix it.

by in McComb, MS on September 10, 2013
1 answer
ANSWER by , July 03, 2014
Replace the neutral safety switch