Sequence-of-tense and basic grammar dictate that "it" is the engine that is faltering. After which presumption begins. Therein lies the danger.

Point being that in a technical discussion, words matter. "But you know what I mean...." does not apply. All we know is what is written. Mr. Easthope is not pursuing this problem with either rigor or logic. All we can do is be clear and concise in what we suggest within the limits presented.

Peter Wieck
Melrose Park, PA