Hi Woody,
Is that the MK1 or Mk2?
The MK1 had a problem with the throttle body, the MK2 much less so but it is an expensive part to replace even with a recon unit so save that until last.
The biggest problem with today's cars is the computerised management system which like windows does not always tell the truth when it comes to problems.8--((
One simple thing you can do is replace the MAF sensor, that is quite cheap and can be changed in a few minutes by yourself, or if you have a multimeter you can perform a test on the workbench using a hairdryer to check the hot readings.
After that, unfortunately, you may have to go down the route of replacing the 2 Lamba sensors one at a time and see if that makes any difference.
I replaced the MAF and the throttle body after getting advice from 2 garages, both were wrong as eventually the 1st Lamba sensor finally showed up as faulty.
This, of course, cost me quite a lot as a lot of people said it must be the throttle body, it wasn't!
When it refuses to accelerate any further what happens when you boot it, does it then accelerate through a flat spot as it did with me?
Martin
When the car doesn't want to accelerate and your foots down to the bottom it still doesn't want to go, but sometimes not always if you sort of pump the accelerator so on and off then it can accelerate if that makes sense.Regarding mk 1 or Mk 2 it's a k12 05 plate