I’ve been experienceing random drops in power when on the motorway I’ve got a auto td5. The car struggles to move from around 65 and won’t rev. All of a sudden it will leap into action and is off like a rocket pulling though to 80 if I wanted. It’s mainly happening on hills and when overtaking wagons. I don’t have a diagnostic tool but I’ve read it might be Maf sensor or linked to overboost ? Might I be on the right lines? Does anyone know of any cheap diagnostic tools out there achievable on a budget I’m not needing anything fancy just for peace of mind really to read live data ie coolant temp. Thanks in advance.