I have 06 tdi jetta ,had car since new, now has 112,000 miles, has had power surge at 2k rpm since about 50k miles. Problem goes away for the first 50 miles after oil/fuel filter change. I thought it might be a fuel pick up in the tank, I cleaned (70k miles)the filter screen in the tank and no difference. Egr started leaking at 80k miles so I plated it, with no change. Might it be the turbo waist gate? or maybe a catalytic converter? Fuel mpg's are at 37mpg and was 40-42 when new. Thanks for your help. Mike