Flat spot 3-4k RPMs

[rendyx]

I have (and have had) a mysterious flat spot in power from 2k-4k RPMs. During this spot, with about 1/2-3/4 throttle, the car begins to jump a bit. I suspect this is a result of my vacuum leak from temporary RTV intake gaskets. Still, before I had that leak, it did this. Plugs and wires are brand new (200 miles on them at the most). The only other "weird" thing about my SHO that I can think of is the exhaust setup. My previous owner installed a single exhaust (single muffler) system, which has one of those kinked bends at the end of it. He also used U-clamps everywhere on the exhaust. Could this be causing it? I also have rasp around when this occurs, which has made me suspect an exhaust leak.

 

[AutoSHO]

If its got rasp around that point its probably running lean. Try cleaning your MAF sensor.

 

[rendyx]

****, I'll just toss in a new MAF that I know is in great condition! I will post the results soon.

 

[rendyx]

Hmmm... nothing