Finally got the 292 fired up today. It started right up and idled smooth, no leaks, oil pressure good, plenty of oil going to both heads. set the idle to 2000 rpm to break in the cam, and after running a few minutes, it started to stumble a little. It smoothed out, and stumbled again, a little worse. smoothed out and stumbled again even more, so I shut it down. checked the valve lash, made sure its getting fuel, all good. now it will start, but won't stay running, it just sputters and dies. Pushed it back in the garage and called it a night because I was becoming mosquito food. Any ideas?