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If i ket it sit for a couple days it will run perfect for a few minutes then it acts like i turned the key off. No sputtering. Im stumped

Thanks for the replies. It has a carb off a running mower. The valves are opening and closing as they should and the decompression is working.

I have a vertical shaft 17hp ohv briggs that will only run at idle for maybe a minute then backfires and dies. Compression is good, flywheel key is good, compression is good, valve lash is good, and spark is great. As far as i can tell timing is good. Tia.