Having problems with your GMC Yukon Denali ?

Gmc changed plugs and wires still misfiring

\015 Says p0300 code i changed the wires and plugs rides better but still sounds congested and a little rough\015 Posted / edited by AnonymousUser on : 22-04-2019

Answers :

If the engine is port fuel injection, you may have a bad injector for one or more cylinders. Fuel pressure could also be below standard.
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