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you might also check your oxygen sensor. I'm not sure of its location on your car, but on mine it sits right at the end of the exhaust manifold. When you disconnected and reconnected you could have damaged it. if you touch the tip of it you basically destroy it. you might want to explore that possibility.
also, the comment about the ecu needing to be reset...DO IT. Some of the weirdest stuff can be fixed by doing that. My g/f's car kept having a dead battery, so we replaced it, and that week she noticed a severe drop in fuel efficiency. We troubleshot it all the way back to the car losing charge, so I reset the ecu...worked fine after that.
BTW: to reset ecu, I do this:
unplug your negative battery terminal.
leave it for about 15-20 minutes.
reconnect it.
be sure all accessories and other car systems are off (stereo, AC, heater, etc.)
start your car, and touch nothing (don't rev it up, or you have to start over)
leave your car to run for about 20 min.
turn it off.
turn it on and go do whatever. that should reset it.
the times i say to wait are probably a little longer than you have to, but its better to wait more and be sure.
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