When accelerating up to speed the car will cutter out or spudder a little and then it will drive fine for a while. What is the cause?

clean the fuel system and clean the distributor cap and rotor etc !

check catylic cowntor ,fuel fiter air filter.

Hi Cory, I suggest you take the vehicle for a diagnostic scan. If you have a speed sensor problem as I suspect, it will show on the fault readouts. Regards John

May need a tune up have a fuel delivery issue. Many problems. Needs to be checked by a Mechanic.

You are a 1990 Oldsmobile sihouette with a 3.1 these vehicle are speed density in other word you are equipt with a MAP (manifold air pressure) when this sensor fails you loose the ability to accelerate or hesitate as you accelerate make sure the vacuum hose is connected to it and it is no leaking vacuum if the hose is okay and it is electrically connected correctly your fix is to replace the MAP sensor

good chance with that problem you were close most likely a misfire will cause that. it would be either your spark plugs or coil pack. also make sure your vacuum lines are good and air filter is good. also bad gas can cause that problem. the worst outcome would be your throttle body going out on you.

Check the throttle position sensor--it may be worn enough to cause erratic signals. Any check-engine lights?

Fuel filter and/ or pump.

Most likely caused by a failing coil pack. The dealer can do what is called a stress test on them to see if they are bad or not but this is pretty labor and time extensive because they have to be removed one at a time to test them. If you have access to a scan tool that will read mode 6 data it may show which cylinders are showing some miss fires and you can try and just replace the ones that show a miss fire and see if that works.