Technician a Says That an Engine That Idles Rough Due

Multiple Choice

Technician A says that an engine that idles rough due to burned valves might run fine at speeds above idle. Technician B says that carbon buildup in a combustion chamber can cause an engine to have higher compression. Who is right?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B