My Nissan loads up with fuel intermittently and will spudder and die. Sometimes it runs fine, but other times it will load up and run very rich. I also noticed it misfires on the upper end. Now this truck has been basically gutted of all emissions controls. The cat has been gutted out. It's pretty much for offroad use. I put a set of good injectors in it. plugs,wires,cap and rotor,fuel filter. I am suspecting a possible MAF sensor. Anyone have this problem? This thing goes through fuel quick. Maybe even ECT sensor? The idle is high as well. Any advice helps.