hi there I have problem with my punto its a 2006 1.4 16v car went into limp mode so got my obd reader out and these codes came up p1680/1682/0638 searched them and all todo with throttle so changed throttle body still the same so changed the throttle pedal and done relearn guess what still the same now iam clueless ive checked the wiring sprayed circuit cleaner on them wiggled all the wires done reset what else is there 2do??? o ya when idling sounds as if car is misfiring is this todo with the throttle problem or something else

Have you checked the air intake system, I had a collapsed air filter on a v w and a mouse nest in an audi that had a similar problems.

did you find cause of problem

Bless ya optimism.....One of the major 'problems' with on line forums,imho,is people asking for help and then not letting the forum know if and how they resolved the issue.