PBiss

Hi all, I have a mis-fire, turns out my loom had melted due to a coil lead being trapped and arching apparently, I have had a new coil loom fitted but still mis-fire, in conversation, true or not?... that the earth straps can cause a mis-fire?, has anyone had any experience of this? I am having the crank sensors checked, any other simple things to check before it starts costing again...... I have had new plugs and coil packs...... always use the good petrol and not supermarket..... whether that actually helps or not but.... any help would be greatly appreciated folks Thanks Phil