I have a 2000 F150 factory CNG truck. It will sometimes idle fast/slow/fast/slow at lights, and sometimes in the middle of a turn, it stalls. I have to shift into N, and restart. Really makes it steer hard. It kinda freaked me out at first, but i've come to expect it and it is not so bad. I do know that it is not right. The AM piston slapping seems to be getting worse, but I am not sure. 72K now... will I make it to the 100K club?