This motor will not run on #4 cylinder at idle.Most of the time it will die when you put it in gear but if you get it going it will run fine at mid-range and WOT..I have tried just about everything i can think of.Good compression and leak down test,it is not the carbs because i have even tried a different carb.Removed vro and put regular pulse pump on engine, good spark,no fuel leaks,new plugs,reeds look ok and so on.....Any body have any ideas...running out of them..