Cat meowing sound when accelerating VW Beetle

P2100 and P2102 refer to the Throttle Actuator not the Throttle body. This is basically the switch system at the actual accelerator pedal. The slow crank and exhaust could be separate issues. Get the alternator tested it might not be supplying enough charge to the battery. Some vehicle OBD systems need to be checked when you fit a new battery. As a battery ages some electronic systems can adjust and compensate for that over time.
If the CAT had gone it would often flag up a O2 sensor fault as the CAT wouldn't be working correctly.
What do you mean by "exhaust noise have increased"? Does it sound louder, Engine's running faster, Sounds rough and uneven? Comment below and I'll try to help you more.

VACUUM LINE DIAGRAMS

There are few direct links showing exact vacuum line diagrams. I suggest you to refer the direct links.

Click the link below: -----

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How to locate the vacuum leak?

http://howtobyme.blogspot.in/2012/01/how-to-locate-vacuum-leak.html

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Vacuum Hose Routing Diagram For 1995 Chevrolet Corvette Throttle Body?

http://schematicsdiagram.blogspot.com/2011/12/vacuum-hose-routing-diagram-for-1995.html

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VACUUM DIAGRAMS For Audi A4?

http://repairhelpcenter.blogspot.com/2011/11/vacuum-diagrams-for-audi-a4.html

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VACUUM DIAGRAMS For VW Passat?

http://vwrepairhelp.blogspot.com/2011/11/vacuum-diagrams-for-vw-passt.html

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Vacuum line diagram For 1996 Chevrolet Lumina?

http://schematicsdiagram.blogspot.com/2011/12/vacuum-line-diagram-for-1996-chevrolet.html

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Vacuum Hose Routing Diagram For 1995 Chevrolet Corvette Throttle Body?

http://schematicsdiagram.blogspot.com/2011/12/vacuum-hose-routing-diagram-for-1995.html

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Vacuum diagram for Isuzu?

http://technoanswers.blogspot.com/2012/01/vacuum-diagram-for-isuzu.html

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Ford 4 wheel drive vacuum solenoid working system?

http://technoanswers.blogspot.in/2012/02/ford-4-wheel-drive-vacuum-solenoid.html

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These will help.

Thanks.

Sounds like you need a new shop.. AND A LAWYER!!!

without putting my machine on it and extracting the gas to see how much gas their is by weight then i couldnt even think of a reason for this sorry

The control unit is designed to automaticaly clean out the cat if it gets clogged with carbon so Im sure its nothing to worry about,hope this helps

Verify tire pressures, and tires with the same amount of time on the ground. Rotate front to back, diagnostically. Also, a brake failing to release can cause a similar symptom.

bad idea as water in a vacuum unit burns out the motor
go to a vw service center and have them show you where the drain hose is an d clean it out on a regular basis

maybe coil pac!!!

hi am no genius but is your car fuel injected ,if so maybe the injector maybe partly blocked and can cause the miss firing of the cylinder. maybe try some good carby cleaner ,it may help

it is but if your check engine light is on there is some vaacium hoses than get crak and old make sure they are ok
but vacium leaks are more easy to find when ideling not under aceleration