Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
I need some more info, is the engine running rough, misfiring etc?
Rpm going up and down really means nothing, every car does that.
The P0011 is important to look at.
Could also be timing chain related.
I would also clean the throttle body.
How many miles on your engine now?
How long, and miles since last oil change?
I hope my advice has been of assistance to you.