I had very similar issues & had 2 separate times of cracked pistons. What got the dealer's attention is that I personally inspected the compression & confirmed low compression in cylinder #1 & then #3 the 2nd time. This really got their attention & they tore down my engine both times. First time was a rebuild repair. 4k miles later I had the exact same symptoms & they tore it down again, but since it was a return, they gave me a whole new engine. I suggest you get your compression inspected. Should be 200 psi in all 4. Both times the cracked piston cylinder was 100 psi.