I have a 350TBI with a K&N, Helix throttle body spacer, and other than that its pretty much stock. Lately, it seems to be idling high every now and then. It usually idles at around 600 I believe. Every now and then it gets up to 900-1000rpm's like after I'm on the gas for a while and then slow down to a light or stop sign. It's like my foot is still on the gas a little, but its not. By the way its automatic. Would it have anything to do with the TB spacer? Any adjustment for it being higher than normal for the cable. Havent really checked it out to close, I thought I'd get some ideas of what to do first. Can anyone help me? Also since the TB spacer install, the tranny shifts at higher rpm's and harder than it did before, possibly spacer related also?. Any help is appreciated.