I started having issues with my car not accelerating when I pull out in traffic. I pushed the accelerator to the floor and it stayed at 20 and then all of a sudden it accelerated to 40. It bucks when I stop at a stop sign or at a light. When I stop I am also smelling exhaust. I am having to change the oil every 1500-2500 miles. I keep up with my oil changes like I am supposed to. If the oil gets low it makes an awful loud knocking noise. I took it to a mechanic and had them to put it on the machine and I had everything fixed that showed up and I was out of almost 1200.00 to only be encountering the same issues. I really like my truck, but now it is starting to become a pain.