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Hi, teachers. Could you help me when you are free?

"The network’s Feb 22 story illustrated a report by David Gilbert, a Southern Illinois University professor who suggested that a design flaw in Toyotas might trigger a short circuit that would go undetected by the car’s computer system, causing sudden unintended acceleration."

What does the participle phrase "causing sudden unintended acceleration" modify in the sentence above? I thought of two ways. One is it modifies "short circuit", and the other is it modifies "a design flaw ~ computer system". I mean that in the second way I think "a design flaw ~ unintended acceleration." as a participial construction. Which is correct? or neither?

*Incidentally, if there are some grammatical errors in my questions, could you correct them?
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It is an adverbial modifying the whole 'a design flaw...system'.
Comments  
tashiroI thought of two ways. One is it modifies "short circuit", and the other is it modifies "a design flaw ~ computer system".
You are looking only for nouns. Pariticipial constructions do not always modify nouns.

causing ... acceleration describes neither the flaw nor the short circuit.

... a design flaw might trigger a short circuit ..., [ thereby causing / and by doing so, cause ] ... acceleration.

The possible triggering of a short circuit by a design flaw (the event itself), if it happens, causes the unintended acceleration. So the participial construction is related to the verb trigger more than to anything else in the sentence.

CJ