Rich You need to sort out the mechanical bit first . Release of your throttle needs to ALWAYS return to a consistent position . Sounds like you have a worn spindle / gunk in the way or an iffy spring . Sort that out first .... if it's not the throttle body then your TPS is worn out .
If anyones looking for a top ball joint (unused) i have one in the garage for the price of a beer. I also have a brand new bottom wishbone / upright bearing ( bought two but then only fitted one as the other side wasnt worn )
Theres a "spare " pair of wires behind the tach. One of these is ?? and the other white with a black line along it I used these for the feed for my shift lights ( DRE) .The white with black is signal .
Trackace lazer alignment gauge . The cheapest on Ebay is £78, yours for £50. Collect from HA5 post code or i will post for £5. IMG_8019_0.pdfIMG_8018_0.pdf
Hardly used , as new . Useful when investigating engine running issues , correctly setting throttle position sensor for smooth running etc . The software is available FREE from the SBD website . Easy to use . Link to SBP website where they are £192 plus post linky Asking £150 posted within UK