Hey everybody, I was just wondering if yall could help me out. For about year now my 87 GN would start sputtering and not wanting to go and would get worse until I replaced my spark plugs and after I replaced them it would run for about a month or two but it's gotten so bad I'm replacing my spark plugs every 3-4 weeks or less to keep it running good but the last two times I replaced my spark plugs within 2 1/2 weeks from each other and it still sputters. But it will sit there and idle forever. I'm just not sure what would cause this?