I have a 87 pulsar. It is a 1.6 single cam,5 speed manual. Yesterday it started to to buck. It won't really idle that well. When I put it in gear it goes fine but when I push the gas it starts to move the bucks like crazy like it get the gas sometimes. I just replaced the transmission also because it was popping out of 5th. Now this happen with new transmission. Any ideas on what I can do to fix it?