Sam - I had the same issue(s) as you and ended up removing the entire throttle body assembly and deep-cleaned it. I've used "circuit board cleaner"... strong stuff and doesn't leave any residues. There is a valve in there (forgot the name of this one) that also need deep cleaning. Just make sure each parts of the assy is well cleaned and put this all back together and you'll have a brand new car bro.
After 10 years, mine was dust-oil-greese-bugs-****************e infested. It was very embarrasing to see.
While at it, you may also want to clean the airbox and conduits. Lots of ****************e residing there as well.
MAF, air filter goes after doing above.
Hope this helps
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