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Hey all. I have a Cobalt LS Coupe that has been sitting for a year. I am trying to get it tuned up and ready for driving again. I recharged the AC, am running 93 octane w/ fuel injector cleaner through the gas, and am going to get the oil change. But I have a few questions:

1. The engine gets rough on idle after driving. When I first turn it on, everything is fine. As soon as I drive down the road, when I come to a stop sign, the RPM dips and it gets a little rough. It comes and goes, and it's not bad enough that the engine stutters, it just gets rough and doesn't feel very good. Any ideas?

2. Should I consider replacing the cabin air filter? It's never been changed (4 years), and I live in South Florida. Not sure if I will see any benefit (improved AC?) from spending the money.

3. Is there anything else you would recommend doing considering it's been sitting for a year with very little or no driving? It's got 50,000 miles on it.

As always, thanks for the help! You guys are awesome!
 

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I'd probably replace the plugs
 
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