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Joe, Mechanic
Category: Car
Satisfied Customers: 319
Experience:  24 yrs exp. with automotive
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Submitted: 7 years ago.
Category: Car
Expert:  Joe replied 7 years ago.
there are a # XXXXX things that can cause this.. 1 is air to fuel ratio is off 2. vacuum leak 3. sensor going bad.. 4 in need of a tune up and also.. weather plays a role.. as well as highway mileage verses city driving.. so there are alot of things that can cause this.. hope this helps..