M6 not engaging into gear

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Long story short had a misfire probably plug or coil

Drove for a round a week, got all the parts in yesterday to do new coils and pugs
For two days it’s been having no power and throwing me into neutral or just loosing power don’t think it’s dct trans due to when it doesn’t act up shifts perfect but now car does not go into reverse or park I gotta hit it back and fourth 100000 times. And literally no powder super jittery and will not move 98% of time

Any ideas going to shop Monday.

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So basically I move it into gear and second later goes park into