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  1. VW GTI MK4 Tune Up Guide

    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 8...