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I don't know how you determined that you aren't getting fuel to those cylinders but if that is true, you now need to determine why. You have to determine if those injectors are receiving power supply and pulse. You also need to first verify fuel pressure. This engine will give you a world of problems if the fuel pressure drops below 55PSI.
My first thought would be a vacuum leak in one of the hoses. Rubber hoses get brittle with age and even a small crack in a hose may cause surging. Happened to me in a Lumina.
you may be getting water on your computer leads. something is getting wet. check all spark plug wires. take off 1 spark plug wire at a time as engine is running replace if no change in sound. if you have a bad plug or wire this will be the best way to find out. should be an easy fix.
You say you replaced the fuel pump, what about the filter? If the filter is clogged it can cause this as can ignition. Since the car started for you after the fuel pump was changed the original problem was the fuel pump. But you should never change the pump without installing a new filter.
No,the oil ratings 10w30 and so refer to how the oil viscosity reacts to hot and cold.As far as running rough,when was the last time is was tuned up,cap and rotor if applicable,spark plugs and air filter?Is it carburated or EFI?
underneth the intake manold is were your fuel injector poppet nozzles are, more than likely the fuel line hose that goes thru the back of the intake is split and leaking fuel underneth the intake manifold if you check the fuel pressure you will find that the fuel pressure will drop down to 0 psi as soon as the fuel pump shuts off and it should hold pressure
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