If your ECM has the same p/n then you can change them. You should install the suspected ECM into the good lift and see if the problem follows the ECM. You wouldn't want to possibly do any damage to the good ECM. Also check that purple wire over very carefully because sometimes the wire is broken in the connector but is still being held firmly in the body of the connector.

Just to further elaborate i started by changing coil positions and the problem stays with cyl #2. I have checked the coil connector and i have the 12vdc and good ground at the plug just no signal on the purple wire ever. I have even tested wiring from crank position and phase sensors all wiring checks out fine.