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Check your basics first, fuel filter is always a big culprit, easy to overlook. Air cleaner, again simple to check. I sounds like it needs the basic tune up and a vacuum leak is very probable.

What we've all verified is that there are so many potential problems with the symptoms you've listed that it is impossible to pin down on an online forum :) . The problem is that modern fuel injection diagnosis is like a stack of dominoes, one simple problem can screw up the entire operation of the vehicle, either immediately or down the road since the systems are designed to compliment one another and are a single sequential program as opposed to multiple programs such as that of a true computer. They also don't cover the entire mechanical operation of the vehicle, so a leaky fuel injector could show up as a faulty 02 sensor, and so forth. Same goes for me, I recommend you take it to a good mechanic if only for a good diagnosis.