No way on the labor. The MAS is about a 15 minute swap out. It sits right before the throttle body after the air filter. Just make sure to reset the ECU by disconnecting the negative terminal on the battery for about 10 minutes.

PS the symtoms sound consistent with the limp mode. The MAS was saying you were pulling a lot of air and the ECU was dumping fuel to make sure you didn't go lean and damage the engine. Over rich wastes fuel and fouls plugs, over lean burns valves and pistons. Pull a plug and check it.