clogged filter?

you can check to see if the injectors are getting power too, test light in the plug of one while someone tuns the key and then cranks it while you test. they only flash for a few seconds to prime the engine, so it will be short. but if they flash they should be working.

if they dont flash, start checking the wire harness for damage. near the pcm where the harness runs past the ac lines in one place they rub through.