Good and bad news, car is now running with no misfire. However, it is occasionally running lean now and the garage reckon it could either be map sensor or ECU.

I'm running a level 1 Ahmed Bayjoo chip with 18 psi boost and just been looking through my folder of receipts and found out a previous owner bought a 3 bar map sensor. I'm pretty sure a stage 1 is supposed to be a 2 bar but as the car was running fine when I bought it so I'm not sure whether I should be putting in a 2 or 3 bar sensor.

The car has apparently had a 3 bar map sensor in it since 2011 (haven't checked its actually in the car) so I would have thought the car would have run badly when I bought it, not just started playing up now if it wasn't set up for a 3 bar.

Any advise would be much appreciated.