i read some posts on mangal giving tamasic energies to matters of sukra if sukra occupies mangals rasi but what if there is yuti between the two for over 4 months?

mangal will follow sukra till july 27 till vrishabha rashi.
started in april 13th onwards.
watching the news it does reflect on some matters but i m not sure.

please shed some light on this.

The effects of one planet on the other is more pronounced in the birth chart, I would say.
So for instance, Venus and Mars conjunction in a horoscope in an appropriate sign (Aries / Scorpio / Taurus / Libra) would give a strong interest in sexual matters.

But transits of the two planets in these signs would not cause the same: transits are applicable to the whole of humanity, after all and we can't expect them to such kind of effect on everybody.

As far as I know, transits of planets are not said to have all the same effects as they would have in a birth chart.
Hope this answers your question?