I am experiencing a low idle surge in the range of 900-1100 rpm. During normal driving this is barely perceptable maybe at most a 25-50rmp surge. When it is extrememly noticable is under load (11K 5th wheel). It is also more noticable in T/H. It does not appear when the engine is cold.

I have searched and read and noticed a few folks with variations of this behavior. What I would like to do with this thread is gather some info from folks who have experienced the same under load symptoms.

FYI My truck is stock (until I get all this Censored figured out). Only 3k miles on the truck. I had an LB7 with over 35K on it and never experienced a similar situation.

My truck does the same thing. I first noticed it at 300 miles. I now have 3.5k and it's the same. I took it back to the dealer and they said "there is no fix at this time"!:mad: We'll let you know when we find an answer. They did the latest flash but no change. One guy at the dealer actually said "these truck have a few quirks you have to get used to".:thumbsdow I wonder why GM is having financial problems:think:

Check out the post about the reluctor ring on the crankshaft. Or do a search on "reluctor".

Let us know if this is the cause of your problem.


Britt