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So I just bought an Alfa Romeo 147 1.9 JTD and when I accelerate everything is fine until I get up to 35MPH then the engine sounds loud until I hit 50MPH then goes back to normal again but the Rev counter is reading normally . What could this be?
 

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𝓐𝓵𝓯𝓪 𝓡𝓸𝓶𝓮𝓸 156 2.0 TS
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Some air intake issue?
Too much air and engine goes crazy
 
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