got a 93 sc quite a while back.It's an automatic with 373 gears (had a shift kit),118000 miles,stock engine.When i got the car it had no overdrive,but ran very strong.Over a period of a few months it began to gradually lose power but still had power and ran great.We rebuilt the trans with lots of goodies (2500 stall,mark 8 gears,aode overdrive etc..).Car was still down on power,changed fuel filter,tested pressure ok,changed plugs on passenger side(forget what they are but from sc perf.) and new magnacor wires,also did leak down test and ok.Still no power driveable though.Less and less power though over time.Finally got around to doing plugs and wires on drivers side,also plugged in vac line that was off of tube between maf and tb.Car ran like hell as if we crossed wires or something.double checked wires ok,unplugged vac line no difference.did not take time for leakdown on that side.Runs super rough at idle if it would idle.Oh also removed cats thinking they were choking it.No check eng light,and no bad codes at auto zone check.Any help would be appreciated. Thanks