Hey guys, I'll be the first to admit that I'm pretty much a doofus when it comes to technical things so I hope you can help me out. My '97 A4 tdi quattro (110bhp) has 70k on the clock and gets about 44-48mpg. I know that the A4 is quite a heavy car but should the economy be better than this? Also, when accelerating hard, especially in 2nd and 3rd, the engine hits a flat spot at 2500ish. Is this a spark plug problem or something else? Any assistance much appreciated.