Audi Repair: HELP!!, air flow sensor, tt roadster

Question
I have a 1998 A4 and for some reason it's running hot even though there is antifreeze in the overflow tank. Thermostat??  Also, I have a 2001 Tt Roadster and it's bucking and sputtering when i accelerate but when up to speed, it runs great...I think it may have something to do with the tubo???

Answer
hello
A4 - I will check t-stat first. check the hose and see if there is a big temp. deference. It easy to replace .
If this will not help you may have bad water pump or somewhere in the system,
TT - Do you have any faults?? With the scan tool you can watch mas air flow sensor, I have seen them going bad and making car bucking on accelerating.
good luck              Greg