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  1. Vendor Deals
    ------ Jetta MK4 1.8T Tuning Software by Unitronic ------ Looking for ECU Performance Upgrades for your Jetta MK4 1.8T? You've stumbled into the right thread! This will be the "go-to" thread for all Unitronic Engine ECU products for the Jetta MK4 1.8T, and if anyone has questions, please...
  2. Vendor Deals
    ------ Jetta MK4 2.8L 12V Tuning Software by Unitronic ------ Looking for ECU Performance Upgrades for your Jetta MK4 2.8L 12V? You've stumbled into the right thread! This will be the "go-to" thread for all Unitronic Engine ECU products for the Jetta MK4 2.8L 12V, and if anyone has...
  3. VW Jetta / Bora MKIV 1998 Euro,1999.5 US -2005
    My car is VR6 2.8L 12v, it has a strange behaviour of misfire. The car trembles a lot at the first cold start in a day. It feels a lot better when the engine rpm drops to smoother idle. What makes it different than a common misfire is the car has plenty of power at lower gear and lower speed...
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