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Are you putting the correct gas in? Have you changed the fuel filter? This is very important and if neglected it can cause the car to idle roughly, and lack power (RPM's will appear lower) and shudder when you try and increase power from 30-40 and 60-70mph.

I would change the fuel filter, use the correct gas, and consider having the fuel system flushed with Sea Foam. It will cost you about $10 for the fuel filter and you can get the whole system cleaned at Sears or any basic maintenance center.

When the fuel filter becomes clogged the car may start but it will act like it is not performing well. Gas consumption will be higher, power lower.

Does it ever act like it wants to cut out when you drop speed, come to a stop at lights and idle? This all points to the fuel system and I would recommend changing that filter once a year!

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