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Discussion Starter · #1 ·
So I have a 2015 f350 with the 6.7, I’m running spe tunes with a 4 inch exhaust. Great truck great tunes BUT! I’ve got a really aggressive engine lope( been doing it for 6/8 months I’ve had the truck) when coming to a stop after doing speed over 45mph. It fluctuates by about 200-300 rpm and sometimes makes a knocking noise from engine and almost stalls out. I have recently done an oil/transmission fuel/filter change and have been using all motorcraft parts for everything. I have not done fuel filters because the dealer “did them” 10,000 miles ago when I got the truck. I’m open to Any and all ideas, this has me beat... I’m hoping it’s not loosing fuel pressure... being a 2015 it has the cp4.2 fuel pump if that helps anyone
 

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Pull a fuel sample and see if you find any metal in it.

Any codes?

could also be a tune issue. You’d need to get some live data for commanded vs actual fuel pressure and control valve duty cycles
 
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