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Almost sounds like your AFM is flying wide open when you ask for some air flow. This situation would make the computer think you are at WOT and would tell the injectors to dump fuel like crazy. I don't know the 75 system at all but I would check this out, there must be some kind of light spring or counter weight of some kind to resist air flow and also return the AFM to closed position when you go back to idle.
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Jeff
'73 GT,5spd,Recaro,EDIS4 2.2 EFI by MegaSquirt, Ali Flywheel w/S10 Clutch, Electric Fan, Roller Rockers, Venolia Pistons, 6 Cyl Intake w/ Custom Injection, 15" Wheels,Lecarra,F&R Sway Bars,Custom Exhaust,1" Sport Spring,Koni Reds,Big Brakes,3 Core Ali Radiator,Hse of Colors Kandy Pagan Gold.
 123 WHP @ 6800 RPM
'64 VW Karmann Ghia
'08 BMW M3
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