i'm willing to bet you fouled out a plug kicking a CEL for a misfire, if you're careful you can clean off the throttle body with the car off, careful i mean not excessive carb clean, just clean and wipe, clean and wipe, but if you're goint to soak the intake with it you should do it with the car running or it'll foul a plug, that's what it sounds like to me, take a look at your plugs, only takes 10 minutes.