Quick Guide to a DIY Tune Up:
My GTI MK4 Tune Up Guide
1. Replace Air Filter and in-cabin air filter.
2. Replace Oil and Filter
3. Replace Fuel Filter
4. Replace Spark Plugs & Coil Packs (or wires)
5. Replace Serpentine Belt and check tensioner
6. Flush Coolant System
7. Flush Brake Fluid
Our 97 cabrio is lacking in the power and as suggested I'm gonna try a tune up. Was thinking the catalytic could be clogged (new muffler, but still loud) but I'll start with the plugs. What else should I check or replace when tuning up a veedub?