The truck listed above c1500 5.0, the rpm's keep jumping up and down from 500 to 1,200 and there is no code coming up at all. What could cause that?
have the same problem?
Thursday, May 21st, 2020 AT 12:47 PM
I would suggest starting to check for vacuum leaks. There are a number of things that can cause this so let us know what you have done so far. If nothing then I would follow this guide first and let us know what you find and we can go from there.