I've just had a diagnostic done on my mk4 1.8 SRi to try and bottom out some erratic idling.
It didn't show any faults, and the garage gave the throttle body a clean. It seems marginally improved but still not as I would expect/like it to be.
I've read on another site that re-flashing the ECU with new firmware (which sounds a bit techy but I assume it is essentially just updating the ECU settings!) can sort this problem. Anyone know if this might help, and how much it might set me back?