Here's a video: https://youtu.be/wYyaW9wRt6U
For a couple of months now my car has had a rough idle and shudders while accelerating - Vauxhall Astra J Exclusiv MK6, 4 years old 61k miles spark plugs done last year.
It starts off shuddering if I accelerate from too high of a gear (low RPMs) and then it progressively gets worse and happens even when in mid-high RPMs to the point where I would be on motorway at a steady 70 mph and still feel faint shudders. I guess as the car gets warmer it just gets much more noticeable.
A colleague told me to the clean throttle body which I did. I didn't notice any huge deposits just some oily grime around the walls and butterfly valve. Unfortunately cleaning this made no difference.
A local garage said they couldn't find the problem and advised me to go Vauxhall dealership which I want to avoid for now.
What's changed since a couple of months ago? I serviced the car myself (air + cabin filters and oil) in September.
For all you mechanically minded people out there, I would appreciate some things I could look into!
OBD trouble code P0301. Which for the "GM" section shows quite a long list of troubles. The problem has worsened over last 48 hours, it is idling is now very rough even from cold and with emissions control system (flashing amber) + electronic stability control (constant amber) on dashboard. Is there something here where I can read between the lines to remedy from home?