In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bennettdan wrote:

markistuff,
   The backfiring my be comming from your ignition the ignition can be converted over to the 4 prong HEI module and controls spark advance very well the megasqurit has some wiring details for that modification on the forum..
Also most injectors are wired with a 5amp inline fuse the high side so the mosfet drivers may not be driving the injectors correctly and might cause some of the high RPM backfire problems...when a mosfet gets hot is does not flow current as well

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