i have a suburban i believe to be about a 12hp unknown due to so many layers of paint. i am having a real hard time keeping it running, it will not idle at all only wide open and seems to be runnning very lean and hot so i stopped using it. i am noticing some smoke blowing out were the head, and block meet so i guess the head gasket is shot could this be causing my problems? ill get some pics up asap of it with the grader blade i built for it's 3pt hitch