99 Saturn SL1 Shakes and Mis Fires Especially when travelling?

bbcac

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I have a 99 saturn sl1 which suddenly started shaking today when travelling between 20 - 35 miles an hour. It did have a mis firing issue about 1 year ago which I resolved iwth new plugs, fuel filter, and wires.
I notice that in the past couple days it misfired occasionally when going up hills. I think I notice an idling sound difference when the car is in park. However, as soon as I put it into gear I definately notice an idling issue. It sputters and the lights dim with the irratic rpms. I can drive it but it sounds like it is going to stall at intersections.

What do you guys/gals think? Thanks for any comments
 
First I would scan the computer with an obdII scanner and see if you have any codes, then it's probably time for a tuneup.
 
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