Testing coils on a coil over plug system?

[buzzinhalfdozen]

OK, so the timing seems to jump a bit and you seem to have an intermittent misfire on 2 cyls. For the timing to move you almost certainly have to have a few missed samples on your target wheel ( crank wheel) that or if you have it set up this way it's falling into another "cell" in your timing matrix. Obviously if for instance the sensor "misses" a few teeth on the wheel it will have no reference to initiate triggering of the coil. Of course a "miss" on the cam sync would most likely cause the same concern. Have you measured the air gap of your sensor and if so have you tried moving it closer or farther away? How bout the run out of the wheel, does it have any radial run oput? A fluctuating run out of the trigger wheel can cause it to lose signal. Man so many possibilties. Would it be possible for you to rig up a test lite using a very small bulb... maybe a 194 hook one lead to power and the ather tap into the injector "drive" circuit, the ECU drives the injector by suppying ground to it. Rigging this up would indicate an issue if say it misses a few pulses... either the ECU driver failed on that cycle or it saw no trigger. Have you ever looked to see if your system shows a real time tooth count for either Crk or cam sensor? Some systems have this some don't, if it does it would make diagnosing the sensors very easy.