[lineslinger]

Broncoman 83,
I reread one of your posts where you spoke of "blasts" coming fom the tailpipe. To me that sounds like an air/fuel ignition taking place while an exhaust valve is open with the combustible gases somewhere in your exhaust manifold or even in the tailpipe. An open exhaust valve during ignition could mean bad sync in regards to your timing. Hope this helps.