Thanks! I'll give that a try. The one thing I didn't tell you is that this is a mail jeep, and it only does the rough idle on the mail route (late in the route and after I have shut it down). I have tried wrapping the injectors with heat wrap, and it didn't make a difference. It used to do it only with the 10% ethanal (spelling?) gas, so I just used pure gas. But now it's doing it with the pure gas as well.