Some of this was bordering on MG Maintenance 102. We were diagnosing a non-functional TCSA circuit (for 1977 and later MGB) which left the car with very little power on the highway, a cracked plastic coolant filler cap (for 1977 and later MGB) which left the car overheating, and a loose bolt dropped into a carburetor from a badly assembled air cleaner, which came very close to demolishing an engine.