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James, Ford Technician
Category: Ford
Satisfied Customers: 3545
Experience:  Ford Senior Master Tech, Ford gas and diesel expert, ASE Certified
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I have a 2010 F150 Lariat, 5.4 V8. When it gets hot, like

Customer Question

I have a 2010 F150 Lariat, 5.4 V8. When it gets hot, like towing a boat, it begins to sputter as if it will stall, but only at about 900 RPM's.
Submitted: 4 months ago.
Category: Ford
Expert:  James replied 4 months ago.
Hello, when this happens does the check engine light come on?
Customer: replied 4 months ago.
Expert:  James replied 4 months ago.
The concern you are describing what what happens when the variable can timing acts up. The first step of course is to replace the oil filter and oil. Ford has proven off brand filters can cause this concern. If that doesn't help the easiest way to diagnose is see if unplugging the Vct solenoid on each engine makes a difference. If it does the Vct solenoids can be bad.