I am looking at a 2019 l220 with low hours. The machine run rough when first started but is fine after warm up, usually a few minutes. The owner has said it has done this since new and the dealer told them it was a computer issue and discounted it when they bought new. They also said they were told there were a few of these that this occured to and it was a "altitude" issue. They have put around 600 hours on it and it is fine after warm up. Has anyone else encountered this? I have never heard something like this before.
