transmission control spark??

Greetings all
so as my quest to find the demon causing me to loose power when towing uphill in fourth gear at times continues I just heard about transmission control spark. I know very little about this but have read a few things online about it causing poor performance issues in top gear.....which sounds on point with my issues....
So, would a 1972 1210 345 manual have this.....if so any info is welcome!!
Thanx!!!
 
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