compression

18' mustang gt pp1 on e85 intake and exhaust 100k miles So ive been trying to chase down this contant mis fire for a long it surges like its running a huge cam with no tune (just using this to explain sound ik coyotes and cams dont sound like that) all during idle, when i try to drive it or rev...

Anyone know where I can buy some decent 12:1 compression pistons for a gen2 coyote? Only ones I can find are some Mahle PowerPak Plus (http://www.modmaxracing.com/product-p/mah930049930.htm). But I don't need forged, just ones that are at least as strong as stock. Looked a decent amount but...