Hi, I would disconnect the shift cable to isolate either the cable or the A4.
There are many reasons for a shutdown and a restart, since it happened at high rpm and your surging after, you may have fuel related issues and maybe more than 1. There could be ignition problems also
Search the site as many people have had this issue in the past.
any fuel filters, pressure gauges ? Last time replaced ? Last tune up ?
Points or electronic ignition ?
type of exhaust ? last replaced ?
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