The alternator/water pump belt was over-tightened, but nothing really to account for the cylinder misfires. It was a "random multiple cylinder misfire" code, which did not really help troubleshoot.
The attending did a lot of maintenance work, so Bonnie should not complain now that I spend no money on her. She got:
- Alternator belt adjusted;
- new spark plugs;
- fuel filter;
- fuel injector cleaner additive in tank;
- missing bolt on intake bracket;
- compression test (came out fine with all at 150);
- front rotors and pads.
The sound of the engine also changed, but I could live with that if everything else was working. Being beat off the line by old minivans is not something I am used to. Not since I got rid of the scooter.
So tomorrow morning, off we go to see the doctor again.