Hi, I have a 93 honda civic with a constant high idle. It idles at 4500 rpms then will drop to 2500 as it heats up I have change the idle air control and the map sensor but nothing. However when I cover up one of the holes in the throttle body (because I have two I don't know if its normal) the idle drops to 1000 but when I step on the gas it drop first before it goes up I'm not sure what to do at this point. Any help is appreiciated . Thanks

The hose from the MAP Sensor goes to the smaller tube opening, while the evaporative canister hose goes to the larger opening.

The hose from the MAP Sensor goes to the smaller tube opening, while the evaporative cannister hose goes to the larger opening.


I checked and every those cables are like that but it still idles high