My 2002 TDI Jetta smokes really bad when I accelerate hard for passing, etc. I don't think it did it as much when I first got it but now seems to do it more and don't seem to have the power it had at first too. It has decent power but seems pick up and go is not as strong as before. VW mechanic told me I needed to pay $200.00 to have head removed and carbon cleaned off. Was he telling truth or just wanting more of my money? Costs almost $100.00 an hour to have VW dealer work on it anyways. I would like to have less smoke and more power so is there a way to get this done? Thanks for any info.