I have a 2003 sebring sedan 4 cyl. when it is really hot out or when i drive the car for about 10 miles it sputters, jerks, rpm goes to 5-6, and vibrates. have replaced coil pak, crank sensor, cam...s i have a 2003 sebring sedan 4 cyl. when it is really hot out or when i drive the car for about 10 miles it sputters, jerks, rpm goes to 5-6, and vibrates. have replaced coil pak, crank sensor, cam...something or other, plugs, that i can remember. stilll nothing works. what can it be?

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had a similar problem with older car. turned out it was my gas tank was not letting in air to replace the gas i was using as i drove. if you loosen gas cap and problem is solved, search for blocked fuel return line to the tank.
repair/replace gas tank if it is seriously 'caved in'.
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