Well, i've still had no luck with the engine. I have checked everything!!! My dad is a mechanic and him and i have spent close to 6 hours each day for the last 3 weeks looking at the engine, and trying different things to see what the he!! is going on. He (my dad) isn't too fond on Nissan engines at all, but still, all engines work the same general way and he has checked all the systems (intake, exhaust, valvetrain, fuel, oil, ignition, etc.) and we haven't found any troubles and we still can't get the engine to even start. I'm confused, exhausted, and almost ready to give up and tow the car to Nissan and get them to fix it (at a moderate rate of only $75/hour) I've replaced the air filter, new plugs, new fuel filter, and other than that, the rest of the engine is running properly. Is there any components of the engine that you guys think i should check out (such as systems/parts that aren't on domestics engines, ones that my dad won't know of) before i give up and dish out the $$$ to get it fixed???