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An update to my issue above. Weather is cooling off here, and it seems to affect how the car runs even more. It's in the 50's or so. Code p0455 is the only recurring code. Per Wayne's suggestion (in some thread or his book) I disconnected the MAF sensor, and it smoothed everything out. Reconnect MAF, and rough running returns with eventual stall. Once everything warms up a bit, it runs fine with MAF connected, but with the occasional stall at a stoplight, etc. Cleaned the MAF again. No difference. Thinking about replacing MAF due to the car running better without it. I know the p0455 code is not connected to the MAF as it has to do with the evap canister and vents to the fuel tank, but would this cause some of the issues? Sorry for the rambling post. Thanks!
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