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Hey guys, i recently bought a used 09 sonata with 36,000 miles on it. When im driving at a constant speed, aroudn 30 mph or 40 mph i feel a pulsing throughout the car. almost like its not getting constant fuel or something. Its not a tire issue, its a different feeling. Any ideas??

I had the car taken into the dealer for the TSB for the hard shifting but this has been a continuous problem.

also on a side note is there an easy way to hook an amp and sub up to the stock single CD player?

thanks
 
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