I have changed plugs and air filter no help
I had this happen recently to our Buick rendezvous. Unfortunately it was due to a blown head gasket. It goes away when warm due to the block expanding. Coolant was getting through into the cylinder. Hopefully this isn't your problem but the same symptoms. We had replaced plugs, wires, and an 02 sensor before comfirming it was a head gasket. Luckily ours was covered under warranty.
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