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Hi All, I need some help please. I have a 2.0L pinto with a fast road kent cam with twin 40 webers with a megajolt electronic iginition, The engine runs fine up to 4000rpm then misfires (almost a cough and back fire 2 or 3 times) then carries on until 5,500 rpm with no issues. So far I have changed the coil pack and plugs, changed the settings on the megajolt, re jetted the carbs (mains and airs), checked the webers for air leaks which appears ok. but I still cant find the issue. I did change the setting on the megajolt and the issue went away during a short drive but after leaving the car for an hour the issue came back. The megajolt appears to be keeping its settings as far as I can see. I am running out of ideas. Any help comments greatly appreciated, Thanks Ian