Vauxhall Tigra poor lumpy idle. wont rev up

Check that you are getting a 5volt feed at the throttle motor ,or turn ignition on and look in to throttle and get someone to press the throttle to see it,s motoring open and shut.sound,s like that,s the area of your issue,just need to prove what part,s faulty,I.e. throttle pedal ,throttle motor,or e.c.u.

thanks for yor reply.i took back 2garage where fault came on. no codes and data ok. throttle valve etc.puzzled. they sed breather blocked and cud have engine damage.i have 2 book it back in. car doesent miss a beat even up motor way but still faults after turned off 10mins.any suggestions wud be good thanks before I take it back.