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Check to make sure you did not switch the firing order when you replaced the cap.
or
You may have a faulty belt connecting your two distributors or one of your spark coils is not getting a spark toone of the distributors.
On my car the car runs smoothly on the primary distributor
It runs rough on the secondary.
I just unplug the wire from the coil to one of the distributors to see if the other distributor is working.
Andy
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