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Discussion Starter · #1 ·
my FIAT manual developed a vibration/ruff sounding engine around 2500rpm! i hit 6,000 miles and when i run the car in colder weather (its dropping to 65degrees here now) the engine hits a RUFF spot around 2500rpms and it creates a vibration through the gas pedal as well as it sounds louder. it doesn't do it in neutral just when in any gear at 2500rpms. the engine is usually very smooth and free revving but when it hits this spot it feels like its grinding...thoughts?
 
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