Correct, compression and leakdown is important if you have already went thru electrical/fuel injector issues. My #3 non afm cyl misfire after all the above test AND Compression (235 psi, 2% leakdown) ended up being a bad lifter and cam. Lifter had over .035" worn off intake roller with damage to cam lobe as well. Enough to allow decent leakdown and compression results, but not enough valve lift and duration which resulted in a miss at idle thru about 1800 rpm. Who woulda thought? And a non-afm cylinder to boot.