My 04 Pontiac Sunfire gets 31mpg, but.
*It shows code "P0455" EVAP leak.
I've tried a different gas cap. I've replaced the EVAP solenoid on top of the engine. I checked vac lines, can't hear any leaks, but my hearing isn't reliable.
*It has a random "miss" or hesitation. It doesn't seem like a missfire, usually does it when accelerating.. Feels like the car "hiccups".
What do I do next?
*Also - I've found oil (maybe water mix) in the airtube near the MAP/MAF sensor. This has me stumped. And worried there may be a bigger problem. The book says this engine does not have a PCV valve.
(I miss the old days when cars were cars, not computers!)