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Super Moderator
2008 SpectraSX, 2014 Optima LX,2006 Jeep Liberty, Linux Mint Mate
6,960 Posts
Well if you got the engine wet and it's mis-firing then you have one/all of these problems...
Bad coil pack(s)
Bad spark plug wire(s)
Bad spark plugs

Rough idle is usually IAC (idle air control) valve. They build up carbon in the throttle body and then they stick causing idle to vary widely and stalling...

Another common problem with "earlier" Spectras is the body grounds. Check the heavy negative battery wire at where it's bolted to the frame/body. It's probably corroded and making a poor connection. Unbolt the wire and scrape the area under it to a shinny /clean condition and then smear silicon grease all over the area to keep water out and then re-assemble it.
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