Time for a test drive
I had a similar problem with my ignition. It wouldn't crop up until I drove it at freeway speeds (on the freeway ofcourse)for 5 to 10 miles then exit. It would idle like crap afterwards and sound like a VW bug when I try to accelerate. It ended up being the MSD box.
BTW.... for tuning, look up the specs for the MSD 6AL for the recommended gap for your application.
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