Quote Originally Posted by Adrian @ SAS View Post
When dyno check was done, did you have your long & short term fuel trims checked together with actual mixtures?
Sounds like your primary O2 sensor is on the way out
No they didn't do anything like this. The previous owner did replace the primary O2 sensor though. It does look pretty new. Not sure exactly how old it is. I would guess around 2 years (I have the service records somewhere). I have considered replacing it but I think they are around $300. Bit of a waste if it doesn't solve the problem I guess.

Do you think it would be worth a try?