2001 Dodge Dakota poor performance

Dear Doctor: I own a 2001 Dodge Dakota 3.9L 4×4 automatic with 74,000 miles. I get poor performance when the engine is not up to operating temperature, including backfiring from the engine. I have replaced the IAC, TPS, MAP sensor, and air intake sensor. Each new part has improved performance, but the problem still exists. When I drive under these conditions it will suddenly “burp” and run fine, until I stop for a traffic signal when all of the problems continue again. When I stop completely and restart the engine, the truck runs like it is brand new! What have I missed? Clyde



Dear Clyde: With the help of Identifix and Alldata we found that on some of these Chrysler vehicles the rear oxygen sensors play a big part in performance, as well as monitoring the catalytic converter operation. I recommend you have a technician monitor all oxygen sensors while on a road-test.  — Junior Damato, Motor Matters

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