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dadsworktruck · 09-04-2011, 10:14 PM

go back and check your intake gaskets , my 5.3 ran awlful in cool weather,i snugged up the mounting bolts and it fixed mine.

09-04-2011, 10:14 PM	#27
dadsworktruck Registered User Join Date: Jul 2009 Location: blacksburg,s.c. Posts: 155	Re: 56.3 runs rough when cold & WOT go back and check your intake gaskets , my 5.3 ran awlful in cool weather,i snugged up the mounting bolts and it fixed mine.