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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?
 

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I doubt it is the fuel itself. Probably something that was done during the engine swap. Double check the fuel system connections, and specially the fuel pump, fuel pressure regulator, etc.
 
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