[mproseusa]

Hey Eric,
I always try to look for the simple solution. I had a similar experience with a backfire. This resulted in a "No Start" condition. I checked timing and quite a few other things that didn't help. I took a long look below the air manifold box (air distributer) and found a gap between the rubber connector and the throttle body. This of course resulted in the air intake sensor not operating. The air flapper could not open due to the massive air leak. The fix was to remove the air manifold box, re install the rubber connector and re set the air manifold box. Take a look under the air box, you might be surprised as I was. I'm not sure, but perhaps the backfire caused enough pressure to dislodge a "loose connection. In any case once the connection was corrected, the engine started right up.
Mike