So the past few days my car has been acting up and i can't quite seem to figure out what's causing it to do so. In first gear when I'm to the floor and the RPMs reach about 5,000 (+/- 100) the car has major hesitation and starts sounding like I've hit red-line but as soon as the revs get past about 5,500 to 5,800 RPMs it stops and acts fine until i sift. Once i get into second gear its fine and just today it did the same thing in second but not as harsh or sudden. This hesitation and almost "WOT Box" sound starts and ends at the same point in both gears (5,000) but doesn't do it in any other gears. This same thing happened to me when I was doing some fairly aggressive driving in the mud and went through a puddle, and I remedied that by changing the cone and cleaning the MAF sensor with an approved solvent. Cleaning the MAF in this case didn't help at all and was hoping someone had some insight as to what this may be.