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There are 3 choices
Choose One- Electronic Control Module
- (left hand front under battery)
- Throttle Control
Engine Computer for 2003 GMC Sierra 1500 HD
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There are 3 choices for the 2003 GMC Sierra 1500 HD Engine Computer !!!
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Electronic Control Module (left hand front under battery) Without 4.3L
Throttle Control (left hand firewall)
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