Yea actually the MAF is to replace a big F up that a local shop did to my car some years ago. When my car was having idling problems they told me that my MAF was shot. So I figured if they were going to replace it, that I wanted to go with an aftermarket one like a Pro-M. So they ordered the part and installed it and it ran okay for a little while but still had a check engine light on. Well, not to long after that, my car sat in storage for a couple of years. Just last year I decided to do some digging around in my engine bay and check some stuff when I noticed they installed the WRONG meter! The one they installed was calibrated for a 93 5.0 Mustang. They actually had to cut the housing down to make it fit in my airbox. Well when I called them out on this they pretty much told me "its been too long and nothing can be done". So after some arguing I just decided to order the right one. I was younger at the time and knew nothing about cars so I didn't think to check their work. Also, they overcharged me big time... over $500 for the part/install. I know this was something I should have noticed after the work was done and is somewhat my fault but boy did I learn my lesson But yeah, hopefully this tune up will help. Im curious to see what the right MAF will do for my car.