I'm so proud of you - most guys here take more than two days to coax into changing their own spark plugs.
Any chance you've still got your old spark plugs lying around to take a picture of them and show us? Were they wet on the tips when you pulled them out?
My guy instinct is that you've got a rat's nest in your intake box, starving your engine of oxygen. This is very easy to get to. There is a black plastic box with wire clips behind the driver's side headlight. Pop that bad boy open - might take a little effort to push the ends apart to get the filter out, but you won't break anything. That filter needs to be changed every 30,000 miles. $15. If you still have the factory one on there, it's dag-nasty by now.
If that's fine, it's possible that your Mass Airflow Sensor is filthy and that your throttlebody butterfly plate is gunked up, causing the engine to suck in the wrong amount of air for the amount of fuel it's putting in. CRC makes a MAF sensor cleaner, so make sure you use that and nothing else on the MAF.
The fuel filter can also clog, leaving the engine starving for fuel. This is located in front of the driver's side rear wheel. This is also a 30,000 mile item. $15.
Catalytic converter can get clogged by 150,000 miles. That will prevent exhaust gas from getting away from the engine... like backing up a toilet. If clogged, you ought to smell rotten eggs, and a good hot engine will make it turn cherry red at night.
Oh. I want you to double and triple check that you didn't mix up any of your spark plug wires. It might sound stupid, but it's more frequent than we might admit. That'll make the engine breakdance.
Um. Oil's full, right?
Also possible you've got a fuel injector stuck open or closed. Or hell. I had a squirrel chew through one of my injector wires, causing my engine to breakdance. So, check for nuts.I use the Crocodile Dundee method.
haha, man, if only that solved everything...