Sometimes, when i drive my car it will "lurch" no matter what gear im in, i'll hit the gas and it will start to "lurch", I don't think it's misfiring because i just changed the plugs and wires, (NGK Iridium, and NGK Wires), plus the problem was before the new plugs and wires, it usually happens when the rpms are between 2500 and 4000, but once you pass or stay below those points it's perfectly fine, ANY HELP WILL BE USEFUL