I have a 2000 Chevrolet C2500 running on stock CNG. I have a rough idle dropping RPM's when I'm in gear stopped, especially when the AC is on. It does it slightly too when in park or neutral. When I run the truck on gasoline the problem seems nonexistent, I might feel it every so slightly, but probably because I'm more paranoid than anything. I've replaced the Distributor Cap and Rotor, and will be replacing spark plugs and wires shortly. Any idea what else this could be, what I could check/clean? Any help would be great, thanks!

SOURCE: 95 GMC Jimmy 4.3l W vin rough idle

My problem was solved when I repaired my 4 wd activation dash switch. The switch was contacting on 2WD & 4HI at the same time. The front differential activation is vacuum activated possibly creating a tug of war that didn't actually engage it but drained off vacuum from the engine? A theory at best but stumbbled across it because I knew the switch wasn't working properly I repaired it and low and behold rough idle disappeared and all is good for 3 weeks running.

SOURCE: 1997 chevy truck running rough

97 chevy 1500 4x4 replaces plugs wires cap rotor dist pick up and crank sensor truck run good when cold as soon it heats up and comes to stop it feels like it boggs down runs rough and stalls any idea what to do?

SOURCE: i have a 1996 7.4L gasoline, chevrolet 3500 that

WOW!!! The only thing I could think of is the timing chain jumped time, or the engine is out of time. Do all the timing marks line up? Please let me know what you find!!!!

SOURCE: 1997 Chevy pickup running rough

injectors may dirty run a pint of marvel mistery oil in a tank of ethel gas in your truck