Assuming that you don't have a scan tool, I would start with the basics.
As stated above, find and fix your vacuum leaks, clean the MAF (I would also clean the throttle body), new air filter, check plugs and replace fuel if you didn't already (I'm assuming that with flood damage that it sat for a while).
If those things haven't been done, they need to be done anyway. Aside from that, you really need to get a scan tool on it.
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