Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Welcome to JUST ANSWER small engines, let me try to help you !! I don't know it all, but maybe together we can get you a satisfactory answer!
Go to the local auto supply and get a spark teste, and check the spark on each cylinder when it is acting up. With Briggs twin, I suspect it has a bad coil. If both coils act up, I would suspect the oil switch .