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missing at idle

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Hey guys. I have a '72 240Z and just put an msd 6al in it with a pertronix ignitor. It ran great, but the tach didn't work, so I got the 8910 tach adapter. After installing that exactly as described by msd, the tach works but the car now misses at idle and up to 2000 or 3000 rpm (maybe higher, don't know didn't rev it more than that). Any ideas???

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