Need help: msd ignition box

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wtbinc

New Member
I just installed a msd ignition box ,coil,distributor cap it was working great for about 2 days when I shifted gears
I was only loseing about 300 rpm if that .last night when I got in my car I started it and it had a small vibration
I drove it down the road and when I shifting I am loseing about 1000rpm I switched spark plug wires but didnt help
could this be in the coil
 
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