My throttle body keeps clogging with gunk and tripping the check engine light. Does anyone have any idea how to stop this and why it's doing it? The engine sputters a little and I want to give it a tune up, but if the throttle is mucking up the spark plugs, I need to solve that problem first.

 

Get yourself some Gumout throttle body cleaner/spray. Spray it in, let the car run a minute or two, and see where you're at. Depending on what's all getting in there, wether it's blowby or what, you can rid yourself of the problem. I had some blowby on my Jetta, I went to put on a cold air intake when I first got it and noticed some oirl (better known as oil) sitting all inside the air box and hoses. I installed a catcher that collects all that blowby, like a reservoir, and hadn't had a serious problem at all. I've seen some use the same thing in fuel lines to catch water, I'm assuming. This is all I know....hope it helps some.