I have a 99 Subaru Forester, with 250K kms on it. Lately, I've noticed that after my car has been sitting for a while (like in the parking lot at work), it taps slightly and the pick up is very sluggish - it can take up to 30 seconds or more to hit 60. Once the car warms up a little - it's fine. The cold makes the car even more sluggish, and I've noticed the taps are more pronounced when I make a turn. Any ideas?