Lost power in the rain (Maxima 2003)

Go to an Auto Zone and have them test your alternator. It may be on it's way out. If alternator seems good, have someone clean your Idle Air Control Valve. If your check engine light came on, you can bring it to a garage and have them get the error codes. That will tell you exactly what the problem is. If no check engine light I would concentrate on the Idle Air Control Valve.

Thanks reelin, I will do that after class tomorrow. Thank you very much..

My 2003 Maxima was doing this and the speedometer and tachometer were acting up also and I replaced the crankshaft sensor (bottom front side of the engine block) and also had my mechanic take apart the computer and clean the flux off and resolder the circuit board and it fixed the problem. File a complaint on NHTSA website as this is a problem with the 2002 and 2003 Maxima but Nissan wouldn't fix mine as it was not "vin code" specific. The NHTSA has a recall on this and it should be fixed for free.

If the above doesn't fix the problem clean the idle air control valve with spray brake fluid. Don't touch the tiny filaments just spray and let it completely air dry before carefully reinstalling it. This is located just to the right of the air filter chamber on top of the duct going to the back of the engine and is held in place with two screws.