Hello I am new here an I have a 03 malibu v6. Recently I had noticed a leak by my coolant temp gauge sensor. I removed it yesterday and resealed it. I had to move the throttle body and the air intake and disconnect all the sensors and the upper radiator hose as well as a coolant line to get to it. I reattached everything and now my engine is reving to 4k in park. It sits at about 1200 when I am at a stop in drive. I dont even have to press the gas and it takes off. It seems like it is running lean to. I cleaned the throttle body and electrical sensors and it didnt seem to make a difference. I went to the parts guy down the street and he said I have 6 codes going. MAP-o2,mass intake flow sensor and a few others. What could have caused all those? It ran fine yesterday? i quaddrouple checked everything and everything is connected. Please help!

 

Sounds like a major vacuum leak. could be the gasket for the throttle body