Got my hands on a multi meter and started running through the diagnosing process after finding compression, spark, and fuel, on all 8 cylinders. Distributor was lined up properly, no noises with the plugs out and rotating the crank by hand. Nice and smooth. So it was on to timing. A few cranks and some work with the multi meter and I came to the conclusion my ICM had failed. Popped a new one on the heat sink and she fired right up. Still had a miss and it was bleeding off compression on a cylinder so it went back to the shop that adjusted the rockers They loosened up the number two rocker and she runs like a dream again!