- Check the condition and attachment of all sensors and controls.
- Check exhaust gas recirculation tube unions.
- Check exhaust gas recirculation tube for cracks.
- Check vacuum pipes for leaks.
| - Loose or corroded connection to the exhaust gas recirculation regulator.
- Loose or corroded connections to the exhaust gas recirculation pressure transducer.
- Loose or corroded powertrain control module multiplug.
- Wiring looms.
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