Based on your very dirty driving experience, it's a good chance it could be a clogged intake filter. It's usually very simple to replace an intake airfilter and I'm sure you can do it yourself once you find it. I'm not sure, but based on a couple pics of the engine bay I just googled, I think the filter is on the front/left corner of the engine bay as you stand in front of the car and look under the hood. It's probably covered in various black plastic shrouding; almost certainly there are some kind of clips that hold the air intake box together and if you loosen those clips and maybe remove a panel, you'll be able to lift the filter out. Do you have the owner's manual...or look online for something to show the intake filter setup if you don't have any documentation about it.
While you are there, try to figure out where the MAF is...again, I'm not very familiar with the VeeDubs, but I think it has a MAF to measure intake airflow, it is located right after the intake filter before the air goes into the motor; I would clean that too but only use specialized MAF cleaning spray...one is made by CRC but there are others. Spray the inside of the MAF since the small wire/s inside that measure airflow could be dirty and that would screw up how the car runs.
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