Q: Sputtering when engine is running

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Our Jetta has progressively gotten worse running well in wet weather. (Sputters as it's going down the road) We replaced the spark plugs and wires. It started after completed, but is still sputtering horribly when running and we are afraid to drive it out of the driveway. I don't know much at all about cars, but it seems like an air flow problem or something. (A good friend with some car knowledge helped do the plugs and wires) Sounds like the lawnmower does when the choke is acting up. It's our son's car while in college, so taking a car with this many miles on a shoestring budget to an auto store is scary! And we aren't sure it would get there anyway.

My car has 189 miles.
My car has an automatic transmission.

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