Thread: tach jumps

Originally Posted by wilder9032

I have a 2006 Pontiac grand prix with the 3.8 and when I am on the highway right around 68 - 72 my tach starts jumping and the car feels like it is jerkyin but than it stops and might not to it agian for a while. I was reading online that it might be a vss (vehicale speed sensor)??? also if someone knows where that is located it would be helpful. please help thank you

I would say further diagnostics are needed, it could be anything.

Jumping tach is a common sign the CPS has taken a crap on you...check into that.

I have the same problem, tell me if you figure it out