Lately every so often I notice my Tach on is starting to jump around all over then it will correct itself. Today on the way home from work it started doing it while I was on the interstate so while it was jumping I hit the gas a bit and it bogged down like a miss. When I look at my Apexi vafc the rpms look fine. any ideas would be greatly appreciated.

 

I had the same problem in a hatch i had, it was just the plug behind all the gauges.

 

Sounds like you have a bad ground some where. Check all your wiring