I'm noticing a serious sputtering when just cruising along in lower rpm's. My bike runs awsome when accelerating, but feels like its going to cut out when holdingthe throttle steady...... Im curently running without the fuel pump, so im thinkingim not getting enough vacuum to get good fuel pressure when at low rpms'... What do yo all think?

 

i think you answered your own question.....the fuel pump is in the fuel system for a reason...