1997 stock TT motor with an Apexi GT spec exhaust, Tanabe downpipe & Greddy bcc installed in about the last 1,000 miles or so. Took car out on a highway run to a charity car show about 100 miles away and it hit fuel cut at highway speeds in passing gear. Was able to continue there and get back home although the car could only continue if I barely gave it gas to slowly keep the speed up, any more it would cut. Code P0172 system too rich showing up twice and P0133 02 circuit slow response. I have looked here and there are no posts to show a solution, any ideas?