UK Car Repair: Idle problems, ping noise, throttle body

Question
Well I finally cleaned it. After the car completely stalled and did not want to start while I was on the road. Until a guy pulled over to help me, and it turned out to be a mechanic, and I he knew right away what the problem was he removed the Throttle body and he cleaned with ABRO STARTING FLUID, and out came what seemed to be grease and he couldn't even believe it. He also cleaned the inside where the throttle body attaches to and much more "grease" came out of it. He was shocked at how much of that grease looking substance came out. He also made sure it worked by making me just turn the igition switch to let power go through the car and it made like a ping noise. Also after he attached it, he made me start the car which took a while, he made sure it worked by removing the cable that connects the throttle body to the computer, I believe, and when he did that car started to shake and then turned off. When he reattched it, I restarted the car and he removed the cable again it started to shake before it turned off he replace the cable and the car remained on. Which means the throttle body works. Now there is much less of a hesistation the car stays at a steady rpm level. But he says if it does not stop hesitating that I should go back to him to do a more through cleaning because inside the throttle body is full of carbon build up. He was such a good mechanic he did not even want to take any money for his work. The jumping has stopped. But the Gas pedal now feels hard to push. Not hard to push, like no matter how much gas I give it, like if I floor it the car does not move until it reaches 30 or 40 km until it senses that it should move faster and then I hear the engine start making the noise of power it should make when it is going fast. After 60km then I feel the power. I hope you understand what I trying to say, cuz I can't really explain it.
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First of all thank you for answering my question. Is there anyway I can do the self cleaning? How do I clean it?. Because mechanics ask a good amount of money to do it. So if there is away that I could clean it, I would really appreciate it. Also what about the throttle switch what do you mean by a fault? Does it need to be repaired or changed?
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I have a 1997 Daewoo Lanos 1.6L DOHC Front Wheel Drive. It runs perfect with no problems. But recently it has been giving me some idle problems. Whenever its in idle, for example at a traffic light, it would start hesitating and sometimes the, rpm it would drop to where it would look as if the car was going to turn off but it would not. A friend told me that I should get the throttle valve cleaned there could be a build up of carbon on it, because he also has a Daewoo Lanos and that is what he did and he said it never hesitated at all after he cleaned it. Also sometimes whenever I want to move out on the first gear or just slowing down and moving on first gear the car if I just remove just a little of the clutch for it to roll on first gear without pressing gas it would start jumping but when as I press on the clutch and give it gas it stops but as soon as I stop pressing gas and just roll on first gear it would start jumping again. Sometimes it does that problem, not all the time.
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Your friend is correct, cleaning the throttle body is the first step, although the second problem "jumping" suggests a throttle switch fault.  Do the cleaning and then let us know.
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Yes, you can clean it, I assumed your friend would explain, but you have to take off the inlet hose assy and get a brake/carburretor type of spray cleaner.  Spray the cleaner onto a rag then wipe the inside of the throttle body and the movable plate, to get both sides you will need to hold open the throttle with something -unless a friend can help you.  The switch -if faulty- would have to be replaced.

Answer
Well, you have to see where the "goo" is coming from.  It appears that your engine is very badly worn as the Goo is most likely blow-by from the crankcase. When the piston or rings wear, lots of combustion gases go down into the crankcase, the only escape for them is through the engine breather which feeds into the throttle body! If this is the case a new/rebuilt engine is the only solution.