The worst purchasing decision I've ever made occur...

The worst purchasing decision I've ever made occurred at Sauers. I purchased a 2005 GMC Sierra 2500 HD in early 2020. A check engine light conveniently popped up on the truck after my two hour drive home (from Sauers). A flashing check engine light appeared at highway speeds later the same day. For the last 1.5 years, I've spent my time and hard earned money trying to fix these two issues. After various tests and parts replaced, the repair shop I'm working with still can't find the root cause. In all my research on the issue, I've come to find out that another repair shop tried to fix these exact issues on my truck a couple months before the vehicle was sold to Sauers (and then to me) and also couldn't find the issue. I purchased a defective truck at a premium price that had a serious issue (unbeknownst to me at time of purchase due to lack of check engine light). Extremely dissatisfied customer here.