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Ford 460 misfire Ron Dempster 10-26-11  
Hi I have a 1989 class c motorhome with a 460ci fuel injected engine with 75k miles on it, when going up hills it misfires and lacks power, it starts and idles fine, runs on the flat fine seems to have lots of power when on the highway but when I tried pulling a car on a dolly on a steep hill it barely made it up and sounded like it was running on 4 cylinders, as soon as I lift off the throttle it runs back on 8 cyls, I am the second owner and have all the bills from previous owner and it seams like this problem has shown up before! it had a new in tank fuel pump & filter plugs cap etc done in 1999 and has done about 30000 miles since then, I talked to a mechanic yesterday about the problem and he said replace the pump again as they give constant problems? any ideas?
Re: Ford 460 misfire simon 8-1-12  
Mm
Re: Ford 460 misfire bob 2-6-13  
NOW OVER ONE YEAR AND 5000 MILES WITHOUT ANY PROBLEM. I am confident the following solve the earlier 460 stalling, stuttering, lack of power issues. These engines were made pre ethanol and were intended to run off of 100% gasoline. I have listed the following that has worked for me.
1. Stay away from Interstate truck stops for fuel.
2.I use the following fuels ONLY and in order of my experience with performance:
a.BP High Test. Preferred
b.High test Shell, Phillips 66, Sunoco
c.EVERY tank use SEAFOAM = TO # GALLONS FILLED, 1 bottle red label ISO HEET. THIS IS CHEAPER THAN ROAD SERVICE
I ALSO DID THE FOLLOWING MECHANICALS,
New better aftermarket in tank fuel pump and filter.
New ECM and Coil.
Wrapped the fuel line and fuel rail with insulation foil.
Installed an in line cooler (small transmission type) in the return line to the tank.
Banks cold air intake.
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