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leaking tubes (common) and cracked coils will both cause misfires.
I discovered my cracked coils after runing through a puddle during a flash flood. no issues until that happened and it cleared up after drying...but.
The suction from oil filler cap might point to failing AOS (again rouch idle) but I would defer to whatever JFP has to say on this. I have always replaced the AOS before they went bad on my cars because they are cheap, the job isnt hard and the cars are almost 20 years old. Just use the hose clamp pliers everybody swears by, otherwise its IMPOSSIBLE!
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