Misfiring under load is usually an ignition or fuel problem. When was the last time you changed spark plugs and wires?
SOURCE: cost to replace 1991 Buick LeSabre fuel line
the fuel line must be made from scratch so about 2 hours labor, or $200
SOURCE: 2000 LeSabre starts but runs very rough and stalls. After
My 2002 Lesabre (app 115000 miles) started something like this. Also the loose gas cap had been coming on for quite a while. I replaced the vacuum line from the air intake to the fuel sensor. It is under the engine cover (twist off the oil filler to remove the cover). There are two hoses together that come of the air intake. The small one goes to the top of the engine. The other goes across the front and makes a 180 turn back to the sensor. Chances are the 180 piece is cracked. It all comes from the dealer as one unit. $25
Seems to have fixed my problems. So if your car is running a little rough. Shutters under load. If the gas cap loose is coming on or probably a number of symptoms this might be the answer. I would replace this item. A cheap try.
SOURCE: Sputters and stalls when warmed up___1992 Lesabre
Crank sensor. Next time it shuts off pour or spray some water on it then see if it will crank. If it does replace it.
SOURCE: 1995 buick lesabre limited, oil gauge issue
Could be two things, your oil pump pick tube is clog, oil pan would have to be drop to check, or your camshaft bearing worn causing low oil pressure,I would not say piston rod bearing or main bearing, cause there's no knock noise. You will have better oil pressure when cold due to oil much thicker. so I would forget about a bad oil pump.
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