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You are describing the classic symptoms of a blown head gasket from the cylinder into the water jacket. This causes loss of compression in the affected cylinder and also injects hot gases into the cooling jacket resulting in overpressure and overheating of the coolant. Perform a compression check of all cylinders and if any are appreciably lower than the others, you are looking at some major engine work.
The very first thing that you should do next is to take a compression reading especially the #4 cylinder, to determine if the mis-fire is caused by a mechanical problem or an electrical problem. If you are looking for an electrical problem when the problem is actually a mechanical one, you could wind up wasting a lot of money and time.
A mechanical problem that would cause a low compression mis-fire in the engine could be a burnt or bent intake or exhaust valve, a worn out or broken piston or compression ring, or even a warped cylinder head.
An electrical mis-fire would most likely be caused by a faulty ignition coil, a worn out or cracked distributor cap, worn out ignition wires, worn out spark plugs, or a faulty fuel injector.
If you have not repaired the #4 mis-fire problem then re-setting or clearing the code will only last until the mis-fire is detected again (maybe only minutes or even seconds depending how bad the mis-fire is), and then the MIL (malfunction indicator light) will be right back on. Try changing the #4 spark plug and ignition wire first, if this does not solve the problem then there might be something more seriously wrong with your engine.
If you do not have a scanner to reset the MIL, then you can reset the MIL by dis-connecting the battery for three minutes and then re-connect the battery, and all of the data trouble codes should be cleared.