The lurching/jerking at cold start has been there since I bought the car 30,000 miles ago and seems to be getting worse. The hesitation when pushing the gas pedal down has gotten worse over the last week, but it is intermittent. The vibration and washboard sound and shaking at 60-75mph started during a 600 mile road trip over the past week. The washboard sound and shaking got much worse yesterday and it now seems to start at 55 - 60 mph and it is more violent and noisy. After taking the car out for a test run yesterday, the shaking and sound seems to be coming from the right side of the car, although I can't confirm it. The brakes were serviced 1.5 months ago with no apparent issue or problem. lugs are on solid. I am going to pull the wheel today and check things out. I saw someone posted about the control arm bearings (bushings, I presume) causing this on their car. My Forester only has 75,000 miles on it, and based on my other cars, that is really early for bearings/bushings to go out. I only drive city and highway. With the occasional dirt road. Thoughts?
When I first heard and felt the washboard sound, I tried a few things....I took my foot off the gas and maintained speed (i.e. downhill) and the vibration went away, leading me to believe that it was associated with the high speed and applying force to transmission....
Thanks for any insight into what the problem might be!