The pcm does control spark, but it is odd that you'd lose that number of cylinders.
Have you tried putting a scanner on it? I have seen before that a check engine light is not on but there were still codes (either pcm signal to dash is damaged, or engine light is burnt/faulty).
It's been a while since I worked on a hemi, are cyl 1-4 on the driver side?
Also test power to coils with engine cranking.
Unplug all coils and attached battey charger/tender.
Test power to one of each coil connector. Attach positive lead of volt meter to coil and negative lead of meter to chassis ground (I can't remember the color of the wire for the power to the coil, so you'll have to test for power to both wires). Test known good coil connector (from cyl that fire 5-8 to know the correct power wire) and then test bad connector (from cyl that do not fire 1-4). You should see a 12-14v power to them.
If power is good then suspect faulty coil/stick coil.
If no power, check fuses throughly (visual and ohm check). If no bad fuses then possible faulty pcm/ecu.
After tests report findings back. (Include wire colors tested)
Friday, February 25th, 2011 AT 1:29 AM