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If you're having issues with lack of power and idle more than likely the culprit lies somewhere with the fuel-injection system. Some items to check are the throttle-position sensor, airflow sensor, O2 sensor, EGR system and the ECM. If you have an Autozone nearby they advertise they'll hook a code-reader up and pull codes for free. Post the codes here or get yourself the Haynes or Isuzu workshop manual. Check for air-leaks as well in the induction areas.

The beauty of the 2.6L is it's simplicity and ruggedness. I miss my '88 LS as it was by far my favorite Trooper and is still running strong with its new owners and over 200K miles. I all I ever did besides regular maintenance was replace a water pump.
 
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