I have an '06 Forester XT 2.5 turbo that has, what I can only discribe as a stumble around 2500 rpm. The car’s maintenance is always up-to-date, and never has anything under 91 octane run in it.This started out when you had the cruise set and now does it all the time whether or not the cruise is used. I’ve had it to 2 shops including a Subaru dealer that had it for a month and couldn’t find the issue. We’ve been through injectors, coils, maf sensor, etc. to no avail. The trouble code that we’re given is a misfire in cylinder 1. We discovered, while trying to find the issue, that there was only 30psi in that #1 cylinder and the valve guides were the issue. So the motor was pulled, heads planed, etc. and new guides installed. Also, put in a new timing belt, and so on, that is usually done when the motor is out.They have done a leak down test and compression tests as well. This is my wife’s car and she absolutely love it, so I need to get this figured out. Any suggestions?