So most know I have swapped to a new built 427. For the most part things have gone well but what I'm running into now is a misfire problem. It seems to happen over 5000 rpm and is hit or miss up to the shift at 7000 rpm. So far I have swapped plug wires back to my old set with no change. Put new 7 range plugs instead of 8 range plugs I started with.. no change and the 8 range plugs looks great. Posted on stinger forum and they suggested I change up my grounds to my coil harness (ign1a coils) so I re did those without change. They said the harness they sold me should have been done differently power wise so I redid the power side to better distribute power with no change. Air fuel ratio is low 13's high 12's with 30 degrees timing (E85) generally when it happens so that should be good. It is only at somewhat higher rpms that it happens. All other situations it works fine. I thought it could be injector related but it's not a constant miss and is only at higher rpm and it isn't always perfectly consistent ( I still may send them off to be cleaned). Rpm is saying it is "synced" throughout entire run. This is all first gear testing right now but I may try a 2nd gear pull tomorrow to see. Anything you guys would test?
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