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Baught a passat 1.8t, APU, 3b5, engine was totally ruined, baught a complete imported engine, with startup the engine was great, pulled like a bullet, suddenly epc light came on, and limb mode, changed the n75 valve, and problem solved, next day it all power gone and heavy jumpy idling, black exhaust smoke, rechecked all piping, and non return valves, when I pull any vac pipe from the intake, the engine idling improves, but still the black smoke..I really need some advice..
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