Todd444,
Because of the hot weather down here (typically in the high 90's - 100's), I have the rough idle problem on occasion also while in heavy traffic. However, while reading through the manual for the Race tuner, I noticed that part of the ECM's job is to cool the engine down if the temp reaches a certain setting on the rear cylinder. The ECM stops firing the back cylinder in order to cool the engine down. I don't know that it actually stops the engine (I've never had it completely stop) but I have (on several occasions) experienced the rough idle that occurs when the one cylinder shuts down. As soon as you throttle up the missfiring goes away, but at makes for a really rough idle. At that point, I shut the engine off and start it only to move the few feet i'm going to move (while in heavy traffic). One time I ended up just pushing it the car length that I'd move every minute or so. I'd also make sure I have synthetic oil (withstands heat better!) in my engine if I were you. I run nothing but synthetic. Other than shutting it down, I don't know what else you can do. Like I said, the synthetic oil made a noticable difference in the amount of heat generated during long idles. I've had it happen with both types of oils in my engine. It wasn't until I read the race tuner manual that I understood what was happening. [smiley=blank.gif]