I have been struggling with these codes for a few months. Every post, starts with MAF (so I changed it), spark plug tubes (so I changed them).... This morning, while the car was running I sprayed the engine down with soapy water...hoping to see an vacuum leak.. No luck. I'm stuck in this loop of thinking I've fixed the issues, so I clear the codes and them it's back a few weeks later. BTW - the oil filler tube is also new, and when I take the filler cap off it changes the engine's rpm's. So it much be on the intake side? Any help would be greatly appreciated.