While driving in any gear and above 20 mph, I press the gas pedal beyond a 1/4 inch and the car revs high and accelerates slowly. If I let off the pedal and press it again it will accelerate normal. The BAS/ESP is on. No codes, as I recently cleaned the MAF and resolved the air pump and egr valve codes. The car has no mods, 05, manual, 257,000 miles, 1 owner (me). Never touch by anyone, but me. Any help would be appreciated.

P.S. Tried all the suggestions for the BAS/ESP light fix, to no avail.