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I've read all the P2195 posts but didn't find what I'm looking for. Most of the posts didn't have a final result.

I have a 03 Focus SE 2.0 Zetec. Intermittent P2195 code. I've replaced:

-Front oxygen sensor (which fixed a P0141 code earlier)
-PCV valve (generic. The old one looks fine too)
-Cleaned MAF
-Checked vacuum leak
-Engine diagnostic with all the readings normal

The car drives fine except during cold start up, the engine RPM fluctuates slightly. And during warm up, it wants to stall at stop signs. After warmed up then everything drives normally. The mechanic ran a diagnostic and everything is normal. He said that maybe the intake manifold has leaky gasket, and after warm up, it expands and the leak is gone.

Any insights?
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