Sometimes they really are that bad.
Cleaning the throttle body is easy. It has been posted several times but I'll give you the short course.
Gather up the tools and supplies you need. You will need a spray can of cleaner, preferably one that says that it is intended for use with teflon coated throttle bodies (but not critical. Find an soft old tooth brush. Normal hand tools including a screwdriver to remove the air intake tube at the throttle body.
Start with a warmed up engine. Shut off the engine and remove the air intake tube at the throttle body. Hold the throttle plate open and spray the throttle body bore and throttle plate with cleaner. Gently scrub the throttle bore and both sides of the throttle plate with the toothbrush. Spray and brush until it shines. Wipe gently with a soft cloth if needed. Open and close the throttle plate as needed to help obtain thorough cleaning. Pay particular attention to a black carbon ring that builds up in the bore just inside the throttle plate. Gentle but thorough is the key here. You don't want to damage the teflon coating.
You may find a label that says do not clean due to the teflon coating. Ignore the label. Clean it anyway, just be careful not to damage it from rough scrubbing or rough treatment. The teflon coating does not eliminate the need for cleaning, but it does make the build up lighter and easier to clean.
When finished, close the throttle, reinstall the air intake tube, and start the engine. It may be a little difficult to start due to the cleaner and junk that went into the intake manifold. It may be necessary to hold the throttle wide open when you crank to shut off the injectors and clear out the cylinders. Once it does start it may run a little rough for a moment, but it will settle down.
Follow up with a good injector cleaner in the tank to clean the injectors as well.
