It could be your EGR Valve. Failry easy to replace and the part costs roughly $90.
Can can also be your Intake Manifold Gasket ... could have a hairline of a crack, causing your combustion ratio to be off.
Your check engine light should be on, if so ... get the code and you will have a better idea.
Cheers.
Might want to check the manifold gasket. Possibly a massive vaccum leak. Do you have a check engine light? If so, swing by auto zone and have them download the codes. Suspect vaccum leak...
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