I had the same issue on my 04 Mach 1 after installing a tune and a CAI. I replaced every sensor you could imagine with no avail. Then, I turned my MAF 90 degrees towards the outside of the car and problem solved. If you have an aftermarket CAI this may involve either redrilling the holes in the heat sheild or removing the heat sheild all together. Don't waste money like I did. Start/Think small and work your way up.