maybe you can give me some tips. I have a1970 buick 455, I installed a msd pro billet distributor and problaster 2 coil a year ago. after the change from original distrubutor start up and performane been great. my problem is ,last week i took it for a ride, then was horseing around by hitting the gas up and down to make the front end lift up. well that when the car backfired and shut off. i tried stating but just backfired and wouldnt start, like it was out of time. well i was worryed that i messed up the distributor gear, witch it what happen to the original. i pulled it out the dist gear and cam gear look great. i reinstalled to same location and still bacfired and would not start, i then started to move the distributor and it started once for a few seconds and shut down. i moved in several location jstto try to fire it up, but the only thing i got was backfire, My disributor was lock down good and ran great and was still tight before i removed it. somhow it sounds like the timming is way off or can it be a coil or plugs that just decided not to work ? what could of i down by hiting it down to jump up the front end, i thought i flooded it originally. its a 1970 455 530 hp ans 600 tourque. do you have any advise, by the way i check coil with ohm its shows ok, but maybe its not putting out full voltage.