Coil packs should always be the first port of call on a 1993 - 1996 classic.
They started to become a problem about 5 + years ago, especially when trying to run additional boost.
Anyone with a 1993 - 1996 model now, that hasn't already changed them, is strongly advised to bite the bullet and fit a new set. You will be suprised by the improvement in performance.
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