Welcome to the forum SyllyLou. Did you notice a pop sound during the rain storm and just before you started having problems? As ronaldk stated a bad cap or wires could be part of the problem. The dampness may have caused a couple of cylinders to cross fire (the spark from one wire jumps to another and fires the wrong spark plug. If the intake valve of the cylinder that fired is open then you would hear a pop sound out of the carburetor. The pressure in the cylinder flowing back through the carburetor can disconnect a vacuum line or blow out an intake gasket. Look at all of the vacuum lines and be sure they are all attached to their fittings. Also check them to see if they are hard and brittle. A car as old as yours will probably have vacuum lines that will break apart when you try to flex them. You can buy a can of WD-40 to check for vacuum leaks. Warm up the car until it won't idle anymore and then have someone "feather" the gas pedal to just keep the car running. "Feathering" is when you push and let up on the gas pedal to try not to raise the engine speed up any higher then you need to to keep the engine runing. Try to keep the engine speed steady but you don't want the engine speed very much above idle speed. Put the red extension on the can of WD-40 so you get a narrow spray. A couple words of caution: Don't spray the WD-40 on the fanbelt or pulleys and be sure to keep your hands away from the fan, fan belts and pulleys when the engine is running! With the engine running as close to idle as you can get it, begin to spray the WD-40 slowly on all of the vacuum lines and along the area that the intake manifold mates to the heads. This includes along the front and back of the manifold. When spraying along the front of the manifold is when you have to be extremely careful of the fan and the moving components!!!!!!! The speed of the engine will increase when the spray finds where the leak is. If this seems like something you don't want to attempt then see if there is a vocational school in your area and ask them if they could check your car for you. This will save you money and give some kids experience troubleshooting an older car. Good luck.