Also if the cylinders were dumping coolant or fuel (due to misfire) then it melted the front of the converter. Most of the time if you rev it to hell then shift and it bogs really bad that's a plugged cat. Be happy. My 94 is an auto with a freshly rebuilt engine. It runs strong but it can't bark tires even if I power brake it on a wet day.

I wasn't aware of the timing plug. I always wondered what that was for. If i was to ground that, my truck would run off mechanical timing mike?