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How do you figure loosening the belt is going to help you? If the belt doesn't slip, it won't drain any less power than it is now. If it does slip, it'll make noise, your A/C won't work properly, and you'll burn the belt off.
The car should automatically increase the idle speed when something is draining power. If it's not, there's a problem. Search for low idle speed or something.
To adjust the tension there is a small pulley that the AC belt runs over. The pulley is in between the AC compressor pulley and the crankshaft pulley. It is about as big around as the bottom of a soda can. It has a 14mm bolt holding it in place. Loosen that bolt up. Then there is a 10mm bolt that pushes against the pulley to raise or lower it. Loosen that bolt until you get the tension you want. Then tighten down the 14mm bolt to lock the setting in place. To make it easier take out the radiator "overflow tank", so you can see the pulleys. Pretty easy.
If the belt is overtightened it's not going to drag down the engine, it will chew up your belt eventually and wear out the a/c compressor bearings prematurely, but the engine is built to take a lot more than a lousy overtightened belt and if your belt is dragging down the engine you've got some major engine problems dude. I'd look elsewhere, like the IACV, try reseting the ECU, adjust the idle.