Seeing that more people have the same problem I decided to repost/summarise under one heading. MY07 EJ204 forester suffered from a hesitation/flat spot between say 1700-3000rpm. It was always there but getting worst or better at times. More info to be found there http://isdc.ie/discussion/index.php?topic=25902.msg304933#msg304933
Contacted Subaru Ireland to find out that there is a ECU remap available for it. As I understand it concerns the EJ204 engine for MY06-07 cars (forester 2.0X, impreza 2.0RX, legacy 2.0R). Had it done (hesitation&cold start they referred to it) at D&M Ryans in Cork at no cost. After the upgrade the car in not only nippier (feels like it has some extra power) with no hesitaion but also the mileage has slightly improved. To add the car has always been serviced at main dealer so it does not seem to get done as part of standard service...
Contacted Subaru Ireland to find out that there is a ECU remap available for it. As I understand it concerns the EJ204 engine for MY06-07 cars (forester 2.0X, impreza 2.0RX, legacy 2.0R). Had it done (hesitation&cold start they referred to it) at D&M Ryans in Cork at no cost. After the upgrade the car in not only nippier (feels like it has some extra power) with no hesitaion but also the mileage has slightly improved. To add the car has always been serviced at main dealer so it does not seem to get done as part of standard service...