It sounds like the computer has given you "limp mode" because it thinks something is wrong. Shutting the car off for a few minutes will sometimes reset the computer. A code will be stored that the dealer can read/reset or you can do it yourself with an OBDII reader such as a Scangauge. As strange as it sounds, you may have to put the old bulbs back to see if that is the source of the problem. Perhaps the computer expects a larger current draw from those bulbs.
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View my fuel log 2014 Mirage SE 1.2 automatic: 46.4 mpg (US) ... 19.7 km/L ... 5.1 L/100 km ... 55.8 mpg (Imp)