Surely it would just save hassle and a potential huge amount of money long term to pay someone to map it, mapping is a huge amount less than a rebuild, £280 at Emerald for instance, but peace of mind, and an even better drive back after mapping!!
Had my injectors cleaned there yesterday 1 had a odd spray pattern just like a steam instead of a nice fan, ok last year seems they don't take to a bit of inactivity too well.
tabetha