Everytime I get off the throttle and shift into neutral my revs drop down to like 300/400 rpm's then go right back up to normal idle....my car has been having a little rougher idle than usual...I know my motor mounts are gone,so thats what probably makes my idle shake my car a little bit,or can all this be because I have never changed my fuel filter,I have about 75,000 miles on my gxe five speed...also my gas mileage sux.Has this happened to any of you?

 

Have you done the speed limiter removal mod? Mine does this if my I have the switch for my governor in the off position.

 

Bro thanks,I removed my odometer sensor which eliminates my speedlimiter also my speedometer..anywho im going to try reconnecting it and see if thats the problem,and if it is why would it do that?