Ok, my 292 is has been showing some blow by out the valve cover breather lately. I decided to try hooking up a pcv valve setup to control the fumes. I pulled off the mercruiser valve cover and replaced it with the stock cover that has pcv provisions. Installed new 3/8 hose and a pcv valve for the 292. The idle went way up like it has a vacuum leak. Also it made the motor miss at idle and on deceleration. The idle also gets real rough when coming to a stop after going highway speeds so the miss is not a constant. The second I cover the valve with my thumb the miss goes away and idle shoots way down. So whats the problem here. I tried another pcv with same results. I was sorta thinking with the added airflow in the motor my carb might be off or lean. Any ideas welcome.
