Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Hi there. I am Cam.Sorry to hear about this issue. When you are idling, you say its not smooth, does it sound or feel like its missing on a cylinder?
Usually they don't give trouble. With blow by, I have only ever seen that as internal engine failure. Watching for a long block may be a good idea. I would see which cylinder is missing and pull that injector. Remember this is backwards. Even on drivers side and odd on passengers.
Other than GM, no I do not. Lets reconnect when you get a code and do a bit more diagnosis first.