Originally Posted by sanguines
Today I noticed that my wrx is idling weirdly. It's making a sound reminiscent of a diesel at idle when fully warm, which it hasn't done before...very rough sounding. I am 100% stock, maybe 19000 miles. I haven't checked anything yet, and I didn't get a chance to run it up to see how the performance is (traffic...). I had an oil change at the dealership about 500 miles ago, fwiw. Anyone else had this issue or know what may be going on?
Skip this step and just bring it to the dealer.