When excelerating ( heavy throttle ) egine seems to be running to lean. I have rebuilt the carb and make adjustments to the metering rod, to provide more fuel durring excelleration. Changed intake gaskets, and repaired all vacum leaks, removed and caped EGR ports. Timing is correct, ign. coil is new, new plugs, wires, cap, rotor,and fuel filter.
82 ford f-150 4x4 300-6
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Re: egine chugs intermitently
Sounds like it might be a vacuum problem check all the vacuum hoses and spray some wd40 around the base of the carburetor while idling. if the engine revs up then you have a carburetor base gasket problem or a leaking vacuum hose
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You need to hone the accelerator pump well and adjust the throw of the pump rod as much as possible to get more fuel. Of course that is just a guess based on 100's of rebuilds i have done over the years. I have also found that Japanese carbs seldom turn out when rebuilt.
On cars with a carb, you could point to lean fuel mixture. Runs rich enough when it's cold, because the choke makes the fuel mix richer. When it's warm. you no longer have that"rich" mix from the choke and then it's too lean to keep running. Could be a dirty jet, dirt in the carb, Dirt in the fuel. the list goes on. Needs rebuilt or blown out with carb cleaner spray works sometimes. Dissasemble and clean out with compressed air. With fuel injection, Throttle bodies, it could be a dirty throttle body, injector,etc, Port injection, could be a sensor or some thing controling fuel, a bad couple of injectors, really not sure. Or a sensor of some sort. If you could get it to Auto zone they will scan it for free and tell you what it needs. Hard to put a finger on it with out seeing it. Have you tryed a good fuel cleaner like lucas? Do you run the tank below a quater tank? This will cause troubles. Best of luck, Those Quad four's are a great motor. lbreen