okay my problem is that when i downshift a gear any gear then throw it in neutral when i reach a traffic light or stop… my idle goes up about 1500 then comes down to normal… it does this when it wants do it … whats the cause of this help!!!
going up 
mine did that for a while because I had the throttle cable adjusted too tight…
nah but the thing is that i didnt touch the cable …it started happening when one day after i pounded the car… some people told me it was something to do with the vaccum