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Hello, do you have the same codes now as you originally did when you changed the injectors? Fuel Pressure is good when it looses power and has it ever had any major engine repairs done like a blown headgasket? What model ford is this in?
Ok cylinder 4 and 5 are next to each other on the drivers side bank. Head gaskets are popular issues with the 3.8 liter engine. Verify fuel pressure is steady and not leaking down when the loss of power occurs. Inspect the spark plugs on cylinder 4 & 5 for signs of coolant burning on the tip of the plug.
it will have a greenish hue on the tip of the spark plug or collection of white ash. Typically green. A compression test will tell more as well, especially if you are running low on coolant
Well number 3 is on the rear passenger side cylinder head from front to back 1-2-3 and drivers side 4-5-6 so was thinking head gasket issue when you have a misfire with two cylinders next to each other.make sure the fuel pressure is good, may have enough to idle and not enough to run, but should have 30 psi at idle, 40 psi with the fuel pressure regulator vacuum hose disconnected and blocked off. And not leak down while diving or under a heavy load/power braking the vehicle with your foot on the brake and in gear.
A pressure relief valve holds pressure in the pump. It should be 30 psi at idle. Its too low. You can disconnect the fuel line at the fuel rail and dead head the pump by hooking a pressure gauge adapter up to the supply line and see if it leaks down, if it does its an issue with the fuel pump. If it holds, its leaking down through a fuel injector
Most auto parts stores rent tools and may have a quick disconnect adapter to fit the supply line to the rail