I am trying to find the problem with rough idle in my car. I took it to the mechanic and he scoped the car. He says most likely is the coil? I tested the coil by itself, using an ohmmeter. The results for the primary resistance, in the 20K ohms scale, were moving between 0.00 and 0.03. The secondary resistance was 8.58 steady.
Does this results make sense or is there a better test to check the coil?
I do not want to buy x number of parts until I find the problem.