Originally Posted by eric@helix
It's going to be hard to connect the 'cleaning service' to misfires. You're about to learn a lot about what kind of dealership you have. BTW, how much was the cleaning service?
Last vehicle I had that had a cleaning service done by a shade tree shop they used seafoam in the gas tank. Killed 5 of the 6 injectors and had permanent high pressure faults afterwards. Had to drain the fuel tank.