Ford Crown Victoria slight bucking at 40-45 mph with no change in power on Ford Crown Victoria

Some Ford Crown Victoria owners report experiencing slight bucking at 40-45 mph without a change in power, which could be attributed to several potential issues. These include a faulty lockup torque converter that may cause stumbling when driving uphill, particularly at 45 mph. Additionally, problems such as cutting out, stumbling, or hesitation could stem from worn ignition components like plugs, wires, and the distributor cap. Owners of older models, such as the 2001 Crown Victoria P71 SAP with over 100k miles, may notice breaking up under low RPM loads, especially when the engine reaches full temperature due to heat soak. In some cases, the air conditioning system may blow hot air instead of cold air around 40-50 mph, indicating a potential malfunction. Jerking during acceleration may also point to common issues like misfires. Furthermore, intermittent bucking during light acceleration in higher gears might be linked to a failing DPFE sensor. Regular maintenance, such as changing the transmission fluid every 30-35k miles, is recommended to avoid problems like shift flare caused by old or contaminated fluid. It is advisable for owners to inspect and address these potential issues to resolve the bucking experience.