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Hi Axel. The airbox is the big black box next to the radiator that holds the air filter. Which, now that I mention it, you might want to check the air filter too, to make sure that is not too clogged.
Disconnect the hard plastic hose just before the AMM and loosen the bracket on top of the airbox and it should tilt out fairly easily. There might/should be another hard black hose at the bottom next to the headlight. You'll see inside a spring loaded flap that pivots to cover two holes. One hole leads to the preheat hose which should be connected to the exhaust header by a special bracket. The other hole leads to the hard hose I mentioned earlier next to the headlight. Controlling this flap is a thermostat, that when taken out looks like an oversized pushpin. If in doubt just replace it I'm not sure how to check it except for at some critical temperature it will change from the pin part being out all the way to in most of the way. Check the brickboard or a haynes/Bently manual for that temp.
I would bet on a bad intake gasket and/or faulty Idle air control motor (bypass). Again check the BB for the procedure on checking the IAC. It's something like applying battery voltage in alternation accross the 3 terminals.
Good luck
Marty
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