[Racer35]

Has anyone else had an issue with erratic idle (with a stock ECU)? My 6MT is about a year old, with 17K miles, and I've noticed a stumble at stop lights over the last couple months. Idle oscillates between 500 and 750 RPM, stumbling at 500. It was only occasional a couple months ago but it happens every time now. This happens with all ECU modes and doesn't seem to have anything to do with where I buy my gas. Until recently, idle was dead-nuts-steady. Wondering if I have a bad sensor somewhere.