I'm gonna bite and put some injector cleaners in the AMG. Went to the AMG forum and they recommended Seafoam fuel injector cleaners. It was $13 for 435mL; they say it's the most expensive but also the best (can't get Techron here where I live). The car has 100,000 miles and I put 50,000 miles on it myself; so I'm guessing the fuel injectors were never cleaned. I think it's a myth, but I also like to be proven wrong. Since the ECU tune and the long tube exhaust headers, the car has been running lean a couple of times, so maybe this will make the problem go away.
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