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You should take your vehicle to the mechanic if it is letting power and exhaust popping.
If your BMW 318 series is letting power and the passage of the exhaust it is important that you take it to the mechanic ASAP.
The present progressive a word for an on-going action in the present.
Examples:
I am letting...
You are letting...
He (she/it) is letting...
We are letting...
They are letting...
Letting in the Sunshine was created in 1933.
Blake Lewis.. finally!!