Replaced the head gasket now it wont start

your testing is no good. (no engine told at all)
the ECM ,only injects using this logic.,

1: fuses good
2: ECM good (i bet yes)
3: CKP and CMP senors dead.
4: if the ECM sees spark dead it cuts all fuel to prevent as seen on TV "CRASH AND BURN" and by LAWs on this fact.
5: some cars have Injector buffer modules between ECM and injector rails.(LOOK OR READ THE FSM)
6: fuel pump dead.
7: fuel filters clogged or it and injectors too (they have 10micron screens)
8: have a NOID light? to see if injectors are not fired by ECM?
the injector plugs all have 12vdc on one pin, do they if not fuse blowN, #1 AGAIN.. USING A DMM, METER.

mostly this list works too BELOW.. (noid lamp fails)
fuses
ckp and or CMP sensor dead. The crank and cam must spin !!!!
if CMP is dead and cam does not spin, well that be cam drive dead.

spark dead, if spark is dead ECM detects it dead and fueling is banned,(blocked)by laws. (fire avoided , win)
way3:
if NOID passes on all injectors (as will spark tests)
fuel pressure gone. we measure it. (bad pump, clogs or bad fuel)

if spark is good test fuel test works.
ever do test fuel on any engine using can-o-fuel or instant start fuel in a spray can, seen engine run for 3 seconds and sounds good.?
RTM FIRST? there are sure more causes, list is common, only. and hard logic truths.

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If you have spark, but no fire, then check injector for proper activation. If good, check compression. If injector good, and compression bad, possible head gasket, valve, piston, etc.

Check the basics. Spark? Fuel delivery? Compression? ECU providing injector pulse (use noid light to check).

when it acts up you need to now if its a spark issue,injector issue such as the injectors are not firing.to chck that ou wll need a spark tester ans a noid light to check the ijector simply hook them up one into the plug wire and the noid light unplug the wire going into the injector and spin the motor and see if the light lights up and the spark plug tester fires.that way you can find out if its fuel or a spark issue.then you will have to go a little more in depth also another thing do you have a check engine light on?is the temperature gauge working i have ahad a problem with the coolant temperature sensor not working right. what it can happen is the parameters are not right for the engine to start and it wont mix the right air fuel raito for the engine to start and run,this can be hard to tell unless you have a scan tool avalible to use.if you find any more out on the first part let me know and ill help walk you through more steps

What test told you it is not firing?

You may have valve damage &
little compression

when the engine is cool spray carb cleaner around the intake manifold

Must be a fuel problem, since you are getting spark. Can you hear the pump turn on when you turn the key to on? I would check the injector circuit, and if it is working, have the fuel pressure checked-might be too low from a weak or tired pump.
The injectors have a hot wire to them-always hot with key in on position. There's also a fuse for the injectors, as well as a fuse for the fuel pump. The ground wire from injectors goes into the engine computer so it can control injector pulse. A tester called a "noid light" can be used to check the injector circuit. Just plug it into the injector connector and crank the engine over. If the noid light is blinking, the circuit is working right.

You need three things to run: spark, fuel, compression (timing). Check for spark simple, check for fuel (crank over engine and pull spark plugs, is fuel on them? ) if not rent noid lights from Autozone or such to check upon injector pulse. If nothing let me know and we'll look further in to it.

Best regards,
Tom

fuel pump, computer, anti theft system,crank sensor

check wires at throttle body. can use a 12 volt test light to check for current. if you have spark it is not the ign module. set meter for 12-20volts. should have 2 fuse boxes on this model, one behind right side of dash at floorboard