Help please ? Very new here as you may see. I have a supercharged 2004 mach with 13k on it. The car was tuned appx 6 years ago in Michigan using SCT software. I have had zero problems since the tune and only drive the car during summer months...I live in Ohio. I finally needed to replace an X pipe and had that done at a local shop close to my house. While driving home from the shop I floored the accelerator and the car ripped as always but then I hit the gas again and there was nothing there, meaning no power at all. After waiting appx. 10-15 seconds I hit the gas again and it had full power. This sequence continued until I stopped driving the car. This was a shock to me as I have had no problems in the past except for the hole in the X pipe which is the reason for its replacement. I thought I had it narrowed down to a bad mass air meter which is a big air 90mm unit. After replacing the MAF I started the car up and it idled and revved perfect like it always did but when I took it for a ride it began to cut out at appx. 1500-2000 rpm's. I have tried some other things but to keep this post somewhat short I wanted to see if anyone has any suggestions first. Thanks for any help that can be given.