Ok, I was doing the SEAFOAM treatment through the pcv valve. When I stuck it back on the intake I decided to check it for leaks. I poured a little seafoam on the hose and plug area and it started making a loud sucking sound! Could this be causing any other problems? What should I do? Thanks!!

 

Maybe you need a new grommet or PCV valve. Some non-ACDelco replacement PCV valves have been known to be smaller in diameter and not fit snugly in the grommet.

 

Thanks, I'll replace both next week.