I have a 2001 pt cruiser replaced the head ,timing belt cam and crank sensor ,still no fire,what all can cause it not to fire?

I just copied this from another site. Better check to see if there is power going to the coils first.
The coil pack consists of 2 coils molded together. High tension leads route to each cylinder from the coil. The coil fires two spark plugs every power stroke. One plug is the cylinder under compression, the other cylinder fires on the exhaust stroke. Coil number one fires cylinders 1 and 4. Coil number two fires cylinders 2 and 3. The PCM determines which of the coils to charge and fire at the correct time. The Auto Shutdown (ASD) relay provides battery voltage to the ignition coil. The PCM provides a ground contact (circuit) for energizing the coil. When the PCM breaks the contact, the energy in the coil primary transfers to the secondary causing the spark. The PCM will de-energize the ASD relay if it does not receive the crankshaft position sensor and camshaft position sensor inputs. The OEM ignition coil lists for about $105. Warning - The direct ignition system generates approximately 40,000 volts. Personal injury could result from contact with this system.

Check if there is spark
and check if there is a signal on injector