So, this kind of baffles me a little bit honestly. Only recent thing done was installing a 110 Amp alternator in her and a Starter relay. However with warm weather my 86 samurai has no balls whatsoever.. I'm talking like 30 or 40 in second gear getting up there really slowly. also in 3rd or fourth nothing over 50 anymore. I noticed it a little before I did the alternator upgrade though. Also, it has new plugs and wires as well as spark plugs, oil, oil filter... Oil level looks great as well. Oh, and I have no cat either. could backfiring be related to this as well?