Got the dreaded CEL (Check Engine Light) a few days ago. It initially started as some burbling during idle, degraded to severe misfiring and lack of power going up a grade (accompanied by a flashing CEL, which is the worst), and after that a solid CEL, rough and fluctuating idle, and the motive power of a motorcycle.
'Twas a bit of an adventure tooling around in limp mode, I certainly didn't break any speed limits for a couple days (and could not, even if I wanted to). Luckily replacement of the four spark plugs with new ones cleared everything up.
Back to 150 horsepower.