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.

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Originally Posted by TxGreaseMonkey

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

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