It’s a 1.6 T. I test the car and he did that stumbling from then but i wasn’t sure is not from my foot accelerating. The smell i didn’t realize. If you sign the contract no money back. I bought from them a power train warranty for a year or 12 k miles. They are a Jeep and Dodge dealers. What i see on google can be the head gasket who let the coolant in fire chamber. This one should be included in the warranty.