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Fine Tunning

hi Folks

I have a GO EFI 600 on my SBF stroked to 427 Cleveland heads

Submersible Pump (Cant remember the exact model, but the one suggested on this site , compatible with PWM, Solid State Relay)

return to tank,

no other mods

managed spark via Fitech

only issues are the ones I've created

this thing runs and performs fantastic with the exception of one small detail

in cruise I have a slight hunt, which I suspect the system is continually correcting itself running rich and going lean

this only happens in cruise,

any ideas?

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Did you get this fixed?  Is the unit controlling an electric fan?   If not turn that off.  Is the unit controlling the timing?