Misfire code Po300 and surge

2004 DODGE DAKOTA
170,000 MILES • 4.7L • V8 • 4WD • AUTOMATIC
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FARR2007
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Po300 and surges while driving.
Dec 26, 2018 at 2:47 PM
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ASEMASTER6371
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Good evening,

I would start by checking the fuel pressure as this is the most common reason for a code 300. low fuel pressure will not provide enough fuel to the injectors for proper fuel mapping.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

How old are the tune up parts?

https://www.2carpros.com/articles/engine-surges



Roy
Dec 26, 2018 at 2:53 PM
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FARR2007
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Where is the pressure regulator location?
Dec 26, 2018 at 6:21 PM
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ASEMASTER6371
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The regulator is part of the fuel pump module in the fuel tank. it is not external.

Roy
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Dec 26, 2018 at 6:28 PM
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FARR2007
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Where on that diagram?
Dec 26, 2018 at 8:41 PM
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FARR2007
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Would a vacuum leak do that too? Also, how to you swap the fuel pressure?
Dec 26, 2018 at 10:20 PM
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ASEMASTER6371
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It is part of the pump.

you replace the fuel pump assembly.

no, a vacuum leak will not effect fuel pressure.

Roy
Dec 27, 2018 at 3:38 AM