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Re: 2009 Cadillac CTS 3.6L Rough idle
Posted to Technical Discussion Forum on 3/16/2023

I bet it's going to need more than that.

My money is on a throttle body assembly. 550 seems a tad bit low.

There is a TSB on the throttle body as well that can cause a rough idle. Reference: [...] [[...]] Login to read more.