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Try a different machine to read the codes then post a reply ,i have no idea what could cause this on this engine as remember that anything over 1.6/2.0 litre is regarded as a big negine here in europe ,most i work on are under 1.2 ,but if its not accelerating from idle then i would suspect a vacumn leak to one of the sensors but not having much practical experiance then i couldnt say exactly
Code 171 means the O2 sensor is telling the computer the fuel mixture for bank one is too lean. Bank one is the side with cylinder number one. The problem could be the sensor, or something else like an injector that is actually causing the fuel mixture to be lean. The sensor would need to be checked.
Could be fuel or ignition. If the coil or ignition is weak, you may not have enough power to fire the plugs under load. And if the fuel pressure is low, you may not have enough fuel under load.
Does it use spark plug wires or individual ignition coils for the each plug?. My 98 intrepid uses coils and occasionally I have to change them out cause it would start to miss when normal temperature was achieved. If it uses wires, try replacing them, along with the spark plugs.
Have you checked the fuel pressure under a load, low pressure will cause these symptoms. The test port is on the top of the engine in the fuel supply rail to the fuel injectors, the fuel pressure test port looks like a large tire fill valve. You will need a fuel pressure test gauge to do this test (about $20), the pressure must be watched while you accelerate, it should never go down on hard acceleration just up about 6-8 PSI
Reving in neutral does not mean the same thing as under load. If you need to pull 4500rpm under load and for an instant the load was gone, you would probably overrev to 6500. With the cover off and motor not running move the throttle to full forward. Look at your carbs and see if the throttle plates are wide open. If they are not all wide open take it back to the dealer. The throttle adjustment is off. You need the full range of travel from idle to topend.
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