My 205 1.9 Mi16 has started to occasionally misfire, or least 'miss' in some way where it just suddenly flat-spots for a split second. It also occasionally back-fires, particularly on coasting. The power seems fine when accelerating, it's when I using light throttle is when it feels not quite right.
I've got a new rotor arm and distributor cap, so they should be OK. The last time I looked at the plugs they looked OK, but ought to check again.
Any thoughts?