2001 VW Golf GTI Problems - Engine and Transmission Concerns

I'm experiencing issues with my 2001 VW Golf GTI. Engine is hesitating and stalling occasionally, while transmission is making strange noises when shifting into higher gears. Mileage is around 120k and I've been noticing these problems over the past few months. Looking for advice on possible causes and solutions from fellow VW owners who may have encountered similar issues.