I assume you mean a Peugeot 307 as the 308 didn't hit the UK market until 2007.
See http://www.peugeot206cc.co.uk/viewtopic.php?f=23&t=15309&p=120875&hilit=P0170#p120875
"I would start by checking for any vacuum leaks in the plastic pipework for the inlet manifold, brake servo pipe etc: It is common for these to crack when they become brittle and this will cause the engine to run lean. Next is to take throttle body off and give it a good clean with carb cleaner or brake parts cleaner. With age, the "throttle plate" and inlet throat get gummed up with a sticky carbon residue which can cause the butterfly to stick a bit, especially at idle where it is nearly closed."
At 10 years old in 2015 the timing belt is due for renewal next year.
ChicksFan
October 2014