An ohmmeter is about useless in finding modern coil problems.

The only way to test the available output is to put it on a scope and pull a wire and see how high the voltage peak goes before the energy disipates.

The reason the ohmmeter doesn't work is that the resistance to ground of airgaps can't be measured and the common problem is internal short circuiting at some voltage. Trying to find this with an ohmmeter would be like trying to judge the size of the plug gap by measuring the resistance. Obviously a 0.010 gap will show the same resistance (infinity) and will a 0.040 gap.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician