Depending on the manufacturer, many coil packs mount on a large transistor plate that actually fires the coil pack. It's not uncommon for those transistor plate to fail.
Normally, I would look first to the fuel metering system for the cause of this problem.
Burnt valve, blown head gasket, bad plug wire.
A fouled or worn out plug, a bad or loose plug wire. There is also a chance that internal engine damage (burnt valve), or even an injector that has quit working.
what are the possible causes of misfire on number one cylinder in a dodge 2003 ram 4.7 liter engine
Check the spark plug wires and make sure they are on the right cylinder. The firing order is 18436572, counterclockwise on the cap. If that is correct, then the distributer could be installed 180 degrees off.
If you've changed the slave cylinder and bled it several times, the next step would be to check the MASTER cylinder and if that doesn't work then your clutch is burned out.
new plug needed... old one black and wet? not firing...fouled out.. take old plug to parts store get same numbers on new one
early for 289 302 windsor firing order was changed to the later 351 windsor firing order to smooth out the firing of cylinders. The early 289 firing order made cams sound lumpy and could cause extra stress on crankshafts when engines were used in motorsport at high rpm
Throwing a rod with Over Revving and overheating or foreign object inside the cylinder
If it ran good before, it's got to be minor.
The answer depends on what operation might cause the change.
Yes, a crank sensor is one of the major sensors used to control engine timing and cylinder firing.