I have just picked up a 96 Pantera 580 EFI Sled with 4400 miles. It is fouling plugs, running rich (if possible on EFI) and backfireing on old plugs only. New plugs still get fouled but don't backfire. Sled idles fine and you can rev it up by pumping the throttle. It seems to run good up to half throttle. After that it bogs and drops RPM and speed. I have not owed EFI befre so am not sure if this is an EFI problem or not. Any help woudl be appreciated.
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