Yes I tried the isolators at the amp end.
I will try the rca cables tonight and will include the pictures.

Yeah I can buy a set of rca cables for like 10-20 dollars with next day delivery!)

So no one seems to mention it, there's two types of cables.
Twisted pair and insulated rcas. My extra spare rcas I use are actually twisted pair. But I may have some insulated too. They're both expandable. I'll include some photos.

Someone also suggested on audio forums that spark plugs and coils can cause problems so I ordered a set of Denso.