Need Help 88 2.2turbo shadow

[88turboshadow]

Ok driving one day. My car starts to miss when in boost. Bought a new head put it on.. I started the car and only firing on number 3&4 cylinder.. I checked spark and it good im gitting gas ive got comprestion but still wont fire on nuber 1&2 cylinder.. swopped injectors,plugs,the motor it timed right but still nothing..whats the problem pleas help!!!

[NAJ]

You need 4 things for combustion, fuel, spark, air, compression at the right time in the right amount.
Obviously you are missing one or more of the 4.
Compression is a MINIMUM of 100 psi with the lowest being within 25% of the highest?
Spark is consistant and strong? A bright blue spark when holding wire 1/4" from a good ground and cranking for 10 seconds?
Firing order is correct, wires are securly seated in the distributor cap? Plug gap is correct? Plug insulators are not cracked? No arcing to ground? Wire resistance is within specs?
Injectors are actually pulsing and allowing fuel into the cylinder? The vehicle fires the injectors in groups, 1+2, 3+4 so you are sure you have power to those injectors and the ground side of those injectors are good? Did you connect a noid light light to be sure the injector is actually being pulsed and the controller has control of those injectors?
Are there any fault codes for injector control circuit?

[88turboshadow]

ive got 150psi in all cylinders.. spark is good and injectors are all working.. thats why i need help.. idont no what the problem is

[NAJ]

If you have fuel, injector pulse, spark and compression and everything is in the correct amounts and at the right time your next step is to remove the valve cover and be sure all the valves on the affected cylinders are opening and opening properly.