my 1998 honda civic idiles very erotic it keeps jumping between 1200 and 2000 r p m s when in neutral, when in gear it wants to do the same but obviousy the transmission won't let it. I replaced the map sensor behind the carb. but no change, when i unhook the wire going to the map sensor it idiles smoother , but will only idile down to 1200 r p m .I and replaced the spark plugs also replaced the radiator cap ,thinking it wasn't circulating the water evenly. What do you think is the matter? Rick
Apr 3, 2010 at 6:50 AM