Possible problem with the throttle control sensor?

What is your question?

Pass couple weeks, the throttle playe area was cleaned wasn't crack& installed new air filter. Then the car felt like it has a misfiring with a soft popping noise in the throttle body area. The check engine light began flashing, could this be the throttle control sensor? Can severe cold weather affect this? Is this a expensive repair? Feb 15 6:30 pm pennsylvania just started with this problem