Take a squirt bottle and put a shot down the throttle body,not a lot but enough to get to the pistons.It should sputter and chugg a bit.if it does, this will mean you deffinatly have a fuel delivery problem.If it doesn't hit a lick,pull a couple plugs and make sure gas has got to them.....P.S...did you check pressure at the fuel rail?It should be 35-45 pounds constant from the fuel pump.