Answer:
The answer is "I checked the carburetor and noticed the butterfly valve was cracked, which threw off the engine's air intake."
Step-by-step explanation:
An audience made up of highly trained auto mechanics is an audience capable of understanding technical language. People in general may own a car but not necessarily know what the car parts are called and what function each of them has. So, most people would not comprehend the sentence "I checked the carburetor and noticed the butterfly valve was cracked, which threw off the engine's air intake", but auto mechanics would. The other sentences, on the other hand, focus on simple details such as the car color, or the flat tires. They do mention a couple of car parts - taillight and hood -, but these are simple and known of the general public.