I purchased a 407 HDI 136bhp about two months ago and I am resonably pleased with it. BUT about every 400- 450 miles it starts jerking as if the engine is missing, This lasts for a few miles, maybe 5-10 minutes. I have taken it to two garages including a main Peugeot dealer who have said after putting it on there computer they can find nothing wrong. No warning signs or mssages are shown on the dash and they are completely puzzled. Any ideas would be welcome. Milage is 48000