when i bought my 96 impreza base model, someone had stolen the total air box set up including the mass air flow sensor all the way to the throttle body. I drove the car home 30 mins and parked it. i bought a stock replacement from a junk yard, replaced it, and now its idling fine, but when i give it gas, it feels like it has 25 hp. when i put the peddle to the floor, it makes no difference, still a massive amount of power loss, and is running very very rich. i have no clue whats wrong with it. i know the MAF sensor is working as it should. I'm stumped! it has the 2.2 FI motor. my best guess was while driving the car home without the air box and MAF sensor on it, it must have messed up the computers settings. please help me?

Not loosing antifreeze. My hoses are sucking in, changed themostat twice. Put new radiator in. Not getting any heat. Would my hearter core plugged cause the over heating? If it does that mean have weak water pump?