I have a Carburated accord dx 5 speed that won't stay running when I push the clutch in or when it is in nuetral unless I hold the throttle a little. I replaced the plugs, cap and rotor, pcv valve and did a oil change and still no luck. I thought maybe the cat was clogged so i hollowed it out since I don't have to worry about DEQ. Also when I changed the plugs a couple of them were a red color and the exhaust seems to be a little on the hot side. thinking maybe the O2 sensor is bad but not sure how to check it and don't want to waste the money on one if I don't need it. other wise the car runs great under power besides a little bit of studering at a steady speed. Any help would be appreciated.