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If I could throw in my 2 cents. I would not drop the engine until I checked/replaced the canister purge valve and or canister purge solenoid. On most setups there are normally closed valves. When they stick open and you fill your tank it pushes all those vapors from your tank to your intake. Will cause engine to run rich due to the unmeasured hydrocarbons in the combustion process. O2’s will pick up on that in closed loop and try to cut injector pulse width to compensate. Thus running ****************ty after car is in fuel control (closed loop). Probably why it doesn’t run like crap for the first 30-60 seconds depending on how long o2’s take to warm up.
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