Join Date: Jul 2006
Location: Tuttle, OK
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The GPR could be going out yes. Someone with more expertise in that will have to help you.
You should always allow the GPs to heat a min. of 30-45 seconds (longer in some cases) in that kind of cold. Give that a try and see if your situation improves.
2003 6.0 F350 dually on high cholesterol fuel (WVO)
2000 7.3 Excursion also on a high cholesterol fuel
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