Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Have you checked compression?
Ok. Do regular cranking compression and running compression if possible. Usually if there is a problem it will show up under a running compression test. The ticking noise may possibly be a bad lifter. These engines do have a problem with the lifters and when it gets bad enough it can damage the cam. I have done a few that don't have a hard miss just idle a little rough.