There are 4 choices

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ENVOY
- Electronic Control Module
  - (left hand engine)
ENVOY XL
- Electronic Control Module
  - 4.2L (left hand engine)
  - 5.3L (next to air box)
- Throttle Control
  - (left hand firewall)
    - (5.3L)

Engine Computer for 2003 GMC Envoy

Fits: ENVOY XL Throttle Control left hand firewall 5.3L (change)

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