Replaced coil pack spark plugs on Saab 9 5 and car still has a miss

You need to identify which cylinder is missing. You can do this by unplugging the fuel injector one at a time. It the motor runs worst after you unplug an injector. I would say that cylinder is not missing. Unplug each one. One at a time to find the one that does not change the way the motor is running. That is your problem cylinder. If it the one that you put the coil and plug in the you have some more checking to do. Get a screw driver and use it as a stethoscope and listen to the injector to see if it is clicking. If it is not. You will need to check the signal to it with an injector noid light it that is good. I would move to check that cylinder for compression. Check to see if the plug is wet with fuel. If it is. It is also possibly you are missing the power or primary signal to the coil. It should have at least 100psi of compression at cranking it a few time.