Before I start I must admit that I did not winterize my boat properly, shame on me. Eng barely runs, lots of backfiring when trying to advance throttle. Eng does stay running when started with open throttle and running at 3000 rpms but stalls as soon as I bring throttle back. I did put fuel stab in and accelerator pump works normal. Lots of billowing white smoke out of exaust, seems a lot more than usual. I'm suspecting a cracked block or head but there's no water in the oil and no external leaks. maybe I'm jumping to conclusions but any idea where to look for a crack, or any other info would be helpful. Thanks Frank
