I'd like to start by saying that this forum and all of the information I've read so far is awesome! I'm a veteran VW owner and I purchased my first TDI in 2004. Jetta Wagon. It ran great with no problems until 2009 when I first started experiencing issues with intermittent power loss and it seemed worse when shifting from 2nd to 3rd and from 3rd to 4th gear. I haven't reviewed all of the information on the site yet but I'm confident the answer to my problem is in here. I've heard it could be the EGR cooler, vacuum hose, clogged filters, etc., so I'd appreciate anything anyone can offer up in terms of which makes sense to replace, troubleshoot first. Thanks!