A dirty TB can cause sticking problems. Engine off, pull the intake tube off the TB. Manually open the butterfly valve with your finger. It will have spring tension on the valve but should open/close smoothly with even resistance the whole way. If it gets stuck, or you feel a clicking, when manually moving the valve, there is an internal gear problem. As ajohns1288 said the only solution is to replace the whole thing.
Cleaning; Engine off, manually move the valve and use a rag to wipe the TB and valve off. Then engine running, spray some cleaner into the TB. Little bit several times. Now clean the intake; Pull the brake booster vacuum hose off the brake booster side. Induce some cleaner into the brake booster Vac hose. You will get white smoke out the exhaust when doing this, engine may run rough, and your CEL may come on. A little bit a bunch of times is better then a lot all at once. Since your now 3/4 done with cleaning, may as well do the whole 9 yards. Get a can of injector cleaner and add it to your next full tank of gas. Till the injector cleaner in the tank is burnt thru, you may notice slightly less power and just a tad more white smoke out the exhaust then normal.
A dealer will charge $100-200 plus parts to do the "Intake and injector cleaning" service above.
_________________ 07 KA Light Khaki, Manual trany. 2.5" Adjust-A-Strut JBA lift, Euro taillights, Home made; Front Tilt Hood, Roof Rack, RAM Air, & CAI. ESP Off Switch Take a ride on the Trō side!
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