I ran one tank of B20 (biodiesel) and it cured my lopey idle. The truck idles smoother then it did new.

I am not running the bio now. Im using regular #2. The bio made it idle quiet and smooth. If you havent tried it I say go for it.

Its a bummer about my lopey idle though. I wanted it to get worse so the stealer could fix it.

PC, just to ask the dumb question, where in So Cal did you find biodiesel.....I've haven't seen it around here....but then I wasn't really looking either. What is the cost comparison.......thanks......Bill

Same problem here with loopy idle, and it's getting worse. Looking for bio in Las Vegas, NV as well if anyone knows...