Edelbrock Pro Flo 4 EFI

Cal Tonsley said

Might be best to talk to Nate at the Edelbrock Forum
Pro-Flo 4 - Edelbrock Community Forum

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Nate is no longer there thank goodness. You’ll have to talk to Peter.

As for the backfire, where do you have the timing set for idle and all in and at what RPM?