This occurs when in neutral and i just rev it. I release the pedal and It stumbles to 500, maybe even lower, shakes for a very quick second, then levels out where its suppose to. This occurs at any speed also when on the road. (ie. putting it in neutral when approaching a light) Aside from this is drives normally. no one would really notice it , but i do. what causes this?

 

Changing the fuel filter solved it for me.

 

try cleaning out the throttle body...

 

i have the same problem, could it be the TPS? The troubleshoot link is dead.