Today, I went to start my car after a few months of not running and started ok but after a little bit, it started popping and banging like the timing was off so shut it down, went thru the mag timing and it was good so restarted and started popping and banging again. Shut it off again and looked in the bug catcher and could see puddles of fuel inside so I got a sample from a puddle and smelled it and smelled like weak alcohol. I went to the fuel jug that I filled the fuel tank with and it smelled weak also. My question is, would bad alcohol make the motor pop and bang and shoot small flames from the headers? I've got a hydrometer on order so I'll check the fuel when I get it but just looking for some answers as to what bad alcohol motor symptoms are. I live in Arizona so we don't get much humidity and I've stored my alcohol for longer times than this last time. The motor: 406ci Dart Little M SBC, Brodix 11x heads, J&E 11.5:1 pistons, Comp Cams grind CS 1612/1639 R 114.0 blower cam, BDS 6-71 Stage III blower and Vertex OAC mag. Thanks in advance for any info provided.