Having problems with your 2003 GMC Sierra 2500HD ?

I have a 2003 5.3 gmc sierre pickup multiple misfire code po 171 po 300 r. h. side clean l.h. side black. any answers

Posted / edited by AnonymousUser on : 10-08-2020

Answers :

Fuel pressure regulator. Pull vac hose and see if it has fuel in it.
Repair Help & Product Troubleshooting for 2003 GMC Sierra 2500HD

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