ok guys another prob. i got a low rpm miss in first and second gear and third. misses like sputtering at 2500-3500 rpm, when i stomp it the missing stops. then wehn im cruisin at 55-70 in OD it does it slightly. i changed fuel filter, wirtes and plugs. i put stock autolites in it that are crap. could plugs be causing a miss? or reg grade gas and crappy plugs? its all stock otehr than gutted cats and flows.