The good news is that testing a misfire code, or misfire codes, or a rough idle condition is not that hard and it's something you can do! In this tutorial, I'm going to explain in some detail the most common causes of misfires and misfire codes (P0300, P0301, P0302, P0303, P0304 -OBD II equipped 1.8L Toyota).
Solder flux is a type of metallurgy component used when soldering two metals together. The flux is an inert substance that prevents the formation of metal oxides at extreme temperatures.
Flux removes oxides coatings from the metals you are joining. Oxides prevent the solder from wetting the metals to be joined, so they have to be removes. Soldering dissolves tiny amounts of the metal of the joints into the solder and contamination stops that happening.