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I have my bmw e39 for almost 17 years 520i 1997, before 1 year i started to remake it from beginning and i put a new engine on it m52b20 model singel vanos, i changed almost all the thing to the engine except disa valve, but my car is still not geting power when i put gas pedal sometimes it looks like running good, a moment later no it runs worse. I dont know what to do more any idea?
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