How many miles on it? If it's had a somewhat recent tune up (plugs and wires) and runs good and still has the catalytic converter I imagine you'll be fine on the DEQ, I haven't lived in that range for over a decade but I had a couple clapped out explorers that passed fine, when you go to the test station try to go at a time where you aren't stopped in line too long and run around for a while beforehand to get the catalytic converter warmed up and into closed loop fuel control...
As to Josh's recommendation there's not much to a 2.3L, they have extra spark plugs on each cylinder so a misfire isn't likely if the engine runs ok, then most everything runs off the MAF sensor and crank sensor, the EGR doesn't do much where they're testing, the canister purge isn't a huge thing on these... if anything a can of MAF cleaner and a new oxygen sensor would be good things to try, all depends if it had issues 2 years ago last time it would have went through...