Hey whats up. I recently just got a new chain and sprockets installed on my o4 blaster. when i got it home was excited to run it i put choke on and started it up and it idled fine. gave it a little gas and it seemed to backfire and stalled. I restarted it and idled fine it warmed up went to drive off and would build of then would just start spit and sputtering and wouldnt go faster. Anyone have a clue? it idles fine just dont understand it.