When I bought my car, I found out that I was getting 12 mpgs. I took it to a local mechanic (bad idea) and they told me my maf sensor was bad. I think they said it was stuck on 2V or something. I had them replace it and nothing changed. I was so pissed so I had them put the old sensor back on. But would this explain my loss of power when the car is warmed up? It seems like when I stomp on the throttle and it's warmed up, the car is hesitating. Boost is building and turbo is spooling, but the car takes it's time to catch on. How can I check maf myself to see if it's bad? are they easy to replace? I know they aren't cheap from experience.. I still have yet to reload ssafc map, waiting for money for wideband