throttle

I finally got a chance to spend time in the van so I take my air box and pipe off to have a look at my throttle body and found this Needless to say it's already off Ive never seen one so grimy. Took me a while to clean and I got so into it I didn't take another pic till if put it on but...

Ok guys please help. I have a problem with my throttle with my 2001 vectra b SRI 150. I can drive normally up to 25 mph and there after the throttle opens up (and its not just a little bit) its full throttle. It only happens after 25 mph. I can push the clutch and the revs hit the limiter. I...