not running a plate is the max fuel, unless this restricts it: the afc springs is too tight, afc washer in the front of rubber diaphram is hitting afc, cap in front of rack is only letting it go 18mm, which is usually enough, 21mm would be max, or you are just not getting the fuel, fuel filter is plugged, lift pump is going out, or fuel overflow valve spring is weak. Or maybe its too much fuel and not enough air, or exhaust housing is too restrictive.