Dazed and Confused
Join Date: May 2012
Location: Upstate New York
Re: Sick Bird
You really need to go digging for this. For starters, you may be able to pull the oil pressure sensor and put a real gauge on it. Could've broken loose corrosion, change in oil of the proper weight may unmask hidden problems, I'd start with pulling the valve covers and see what the valve train looks like.
Ever notice that there's so many high performance parts available for GM products?
Did you ever think that maybe they NEED them?