bg289

This is my first posting and I can't help but think some of you have been here before. I have a 93 impreza with a throttle body. the car won't start if it is below 30 degrees or so unless I spray either into the snorkel. Once it starts it runs very rough for 15 to 20 seconds and then POOF! everything is great. I picked up a used throttle body from the junk yard and it made no difference. The car has 158,000 miles and everything works fine except for this no start cold issue. Any Ideas? Thanks, Bob G.