General health check.  Not quite sure what is the problem.  Runs good at idle.  Runs good up through the 4 gears till about 3500 or 4000.  Then I get some misfire or backfiring.  It might be in the distributor also.  Just trying to do some general checking before taking to a shop. 

So your saying doing a hot leak down test on a cylinder should be 94 psi if the incoming is 100 psi ?  Do not understand the 6%.