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Problems with mk4 Jetta 1.8t

1K views 0 replies 1 participant last post by  189nick 
#1 ·
I bought a mk4 Jetta 1.8t with various upgrades. Ko4 turbo. Stage 2+ ecu. Silicone inlet pipe. Cold air intake. The car is still on stock injectors and maf and runs like crap. Is it time to upgrade injectors and maf or could there be something wrong?
 
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