Model Number: UF378. Manufacturer Part Number: UF378. Part Interchange Info: UF378 F505 5C1409 EAB 56028394AC 56028394AD IC508 IC585 GN10372 IC508 C-648 C1414. FUNCTIONEnsures balanced and powerful ignition across all cylinders, effectively eliminating engine misfires, rough idling, and jerking caused by weak sparks.