Right so had the car on this morning before work, the battery was out being charged so any error codes are well and truly gone. Fitted the battery, started the car left in P and straight away this time the idle was all over the place, including the car stalling. Restarted it and went to take it round the block and straight away same symptoms again, gear slams, hangs at 3k rpm. Now I know it can run a bit differently when the ecu is reset as have done it a few times.
checked ecu and almost straight away this time error 41. So Its not temp related as the car would still have been cold, so going to poke the electrics this weekend
Its not going to beat me!