Well I just got a deal on a 96 4.3 blazer. The rear main oil seal is leaking. So I am going to pull the engine and rebuild. It has 210k on it. I have worked alot on CPI 93-95 blazers and I know the common problems with them. Is there any common problems with the 96 vortec? Right now it idles high. The master cycler needs to be replaced. Any common problem that would make it idle high?