Current symptoms are when starting from cold it takes a few seconds before it catches. If left to idle on it's own it will stall, then take a few attempts before it will start again. If you blip the throttle it almost stalls then slowly the revs pick up.

Appears ok when warm except for the fact that it now surges between 55 and 65 mph, sometimes quite badly, similar to pulling the clutch in then letting it out non too gently!

ECU bad?