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Unplug the MAF. see if it runs better.
Also, my car had a similar problem at low rpms. It was a simple problem but there was a hole in my intake pipe after the maf where the resonator for the stock setup goes. It was open to the atmosphere and causing the car to misread airflow thus causing it to bog. I taped it for a quick fix and it fixed the problem.
Also, check your distributor cap. Especially if the car sat for a long time, there could be corrosion build up on the terminals inside. If you pull it off and they are white or the rotor is white, just change them both. They are cheap and it's always good to "tune up" your car.
This problem happens a lot with 240s and sadly there is no one cure as it could be many things causing the same problem. Best advice would just be to check the basics first and find any potential problems. Change items that seem worn and don't replace expensive items unless you are 100% sure through diagnosis. In the end if you have changed out a good amount of things you will have less problems down the road and your car will run right. So, don't worry if you spend a few bucks changing things that ended up being unnecessary as they would need to have been changed at some point.
Most of the time these problems arise out of nowhere because the owner failed to do basic maintenance on the vehicle. Sometimes a simple tune up can fix these problems. 80% of the time, it's something simple. Finding out what that problem is though, isn't always as easy.
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