I have an 06 fx35. Just did a motor swap cause the old one spun a rod and after a few quick trips to the gas station and back I noticed the engine was sputtering and breaking up in gear but when I put it in neutral it revs fine. Now it won’t start. I was thinking it had something to do with the gas, i put 87 in and maybe it’s because it needs premium even though it’s recommended not required. Any suggestions on what to do or where to check?