Well after my second upgrade I'm up to a 106 with a S & S stroker crank and some major starting, idiling, and a pop/backfire issues. Please Help! I recently put my engine back together after the lower end rebuild and some new pistions. On my initial I had some trouble getting it started but finally got the carb some gas, after it finally started I had some trouble starting it and getting it to idle. It seems the front cylinder is not running so good, it is popping and slightly backfiring through all throttle positions. And I had to keep the throttle cracked to keep it running. So far I have tried swapping the spark plugs and re gapping them, no luck, also I thought I might be sucking in air at the intake seal, so I shot some break free in the area but the engine pitch did not change. Next I pulled the carb and intake but the seals looked fine, so I reinstalled them and again, no luck. FYI, I have a S&S Super G and TwinTec ignition.