Timing Light Question [Archive] - Toyota MR2 Message Board

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Hi All. So dumb question I guess. I assume that the hook on the timing light that goes around the #1 wire is reading the pulses of electricity that are traveling down the wire. If the spark plug is bad, will the pulse still travel down the wire or will I get a 0000 reading? I took off my dizzy to take a pic for someone and put it back on. Suddenly my number 1 wire is reading 0000...then 790...then 1000...then back to 0000...and of course the car sounds like it is running on 3