The 2TB motors do benefit from a throttle body balance, but it's best if all else has been attended to. Set your multi meter to ohms & test the spark plug caps & HT wires back to the coil. Mine shows 8 somethings each side. The caps don't last forever, and if you have any green on the copper wire ends, clip them off. Check your breather hoses for perishing, ensure the water overflow spigot under the fuel tank is not blocked (it tends to accumulate corrosion there), ensure there are no leaks in the rubber manifolds. Your fast idle should be working smoothly and the throttle cables work properly (the lock nuts at the throttle body end can vibrate loose over time). Clean & Vaseline your battery terminals, the lugs & the earths to the gearbox. Do reset the tappets before the TB balance.
