i did my head gasket got the head rebuilt by a local machine shop i got everything put back together and now when i start it im idleing hi and i have a slight miss ive rechecked the timing marks and there on when i turn the distributor to set the time a 10deg i sit at about 2-2500rpms and when i drive it it loses power afte r 3500rpm and shakes any suggestions would help im going nuts