Engine parts — throttles (6)

I believe the answer is:

chokes

I believe this clue is a double definition.

'engine parts' is the first definition.
(choke is a type of valve in a car engine)

'throttles' is the second definition.
('choke' can be a synonym of 'throttle')

(Another definition for chokes that I've seen is " Suffocates or asphyxiates".)

I've seen this clue in The Guardian.

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