As some of you know, I am the proud owner of a nice '92 XM 2.0 TCT, which can be seen here: http://jvgavila.com/xm.htm
Some days ago, one of my other cars, which was my daily used one (a '99 Renault Espace 3.0 V6 24V) started losing petrol... so I decided to use the XM, which was sitting unused due to an exhaust hole which prevented passing MOT. Then, when I got it running, it started to smoke, as commented in other post (viewtopic.php?f=4&t=3121). Well, as first day I was unable to drive the car (which cleaned the smoke problem) and I was afraid of a big problem... I started to look to other cars (and fastly came a fixation with '99-'02 A6)

So I got caught by the Audi A6 disease



The reason is that my TCT needs some care and I am debating between fixing it or selling / scrapping it. There is nothing too expensive (I think...), but there are several things which may add up to a relatively large amount.
The problems I have right now are:
-Damaged exhaust (as commented here viewtopic.php?f=4&t=3132)
-Engine not running smooth (or at least not as smooth as I think it should run): I have had this (perhaps it has slowly worsened) since day one of my ownership, when car was 8 years old and had 210.000km on it, back in 2/2002. Now it has 250.000km (as you can see, I use the XM sparingly) and I have always suspected of an injection problem, probably due to worn injectors (as I have replaced engine ECU, spark plugs, HV coil, ignition amplifier and other bits with no difference on that)
-Suspension: it is not yet bad, but not as good as when I replaced all spheres almost 10 years ago. Also, strut mounts are still original and I am afraid someday they will collapse.
-Some electrical bits: one unworking door lock (driver's side), sporadic ABS faults, some dead display bulbs and other small things.
All in all, the car runs nicely except for the engine thing (it is driveable and perhaps it is the way the TCT works?), but I need to fix the exhaust, pass MOT and then try to fix the other things.
So... would you fix the XM and forget about the A6?. Please, tell me bad things about maintaining a '99-'02 A6 and good ones about doing so with a '92 XM. I need help

Regards,
JOSE