My brother's 99 GT....

He went somewhere and as he was getting there the car wouldn't accelerate much. When he went to leave now, it won't start.
I'm going out there tonight in about 4 hrs to take a look at it. Any ideas?
All I know so far is the belts OK, fuel rail had pressure, and there may have been some ticking sound from around the coil packs.


=====UPDATE========
*Fuel pressure is good ~55psi and stays high.
*All 3 coil packs have good spark, although I thought one of them was kinda weak at first.
*Fuses all good, swapped ignition relays.
*Took apart and cleaned ignition module and coil packs, even though spark seems OK.
*PCM has been replaced.
*Spraying starting fluid into the TB (around the MAF) does absolutely nothing. Not even sputtering!
*Oil does not appear to contain coolant.
*Starter cranks strongly.
*Valves are moving (so timing chain should be OK)

=====UPDATE 2 ======
*Swapped ignition module (under coil packs).
*Swapped coils.
*Theres some pressure at the exhaust tips.
*Tested continuity between injector wires and PCM connector. One of them (center front) does not conduct. I uplugged that injector on my running GP and it runs, just a bit rough, so that shouldn't cause the issue at hand (might have damaged it when unplugging to test).

Since spark and fuel is there, and spraying starting fluid did NOTHING, this is really confusing!