tried that too , even took out the spring on the mustang (easier to get too) a little change but not enough , both are dry around bottom seals and not rumbling bearings so i'm not going there lol.. so far as i cant tell no air leaks , no cracked manifolds , nothing wrong really seems they just dont wanna play the game !!
one was a tradein so it might become parts yet hahaha . but thanks squizzy

cheers