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IF WHAT YOU SMELL IS RAW GAS THAT IS AN URGENT PROBLEM THAT SHOULD NOT BE PASSED OVER. IF YOU SMELL A ROTTEN EGG SMELL THEN YOU MIGHT HAVE A CATALYTIC CONVERTER PROBLEM THAT GIVES POOR ACCELERATION. CHECK FOR FUEL LEAKS AND CHECK FOR ENGINE VACUUM AT IDLE. MUST BE AT LEAST 19 INCHES,. IF NOT, YOUR CONVERTER IS PLUGGED.
The sensor is the oxygen sensor and it has a lifespan based on mileage and that is around 60,000 miles. If they go bad you have the driveability issues that you are talking about. But if the catalytic converter is bad too then it makes it worse.
The obd light with tell specifically what it is, is it gas or rotten egg - the latter means catalytic converter, gas smell probably flooded or not firing on one or more cylinders, need more details. Also, if the light is flashing it's warning of catalytic damage - raw fuel hitting the cat, smell could be heat from cat trying to burn off raw fuel,it will glow red hot.
the light blinks to let you know that the engine is misfiring and dumping raw fuel in to the catalytic converter . It will burn up the catalytic converter if the problem is not corrected leading to a much higher repair bill
I suspect you have plugged catalytic converter - hence the whistle. If you hook up a vacuum gauge to the intake manifold vacuum port, it will be low, like around 10 when it shoul dbe 17 incehs of vacuum.
Was you check engine light flashing? If so, too much raw fuel getting in converter overheating it.
Ps.. I have the same problems that is turning worse - my MPG is now 15 - ouch...
Check your Catalytic converter - there are 2. Becareful because I was pushing my engine so hard that the Catalic converter was glowing orange. After I got this fixed, I was able to maintian highway speeds but I know that this is only the beginning. My next fix will be the cleaning the MAP sensor as described in this website.