Car kind of jurks on take off somtimes has bad idle whene just sitting still
1999 Vauxhall Corsa 1.2 16v club t reg petrol

hi my corsa sometimes jurks like hesitation when taking off, sometimes idles funny at just over a 1000 just under 2000 revs like up and down makes exhaust sound funny i have to rev the car up couple of times to get it to stop reving like that to get it reving normaly but this doesent always happen just sometimes when sitting still. My engine managment light stays on when sitting still but when take off it goes off and stays off when sitting at a steady speed just sometimes it comes on when slowing down if i was sitting at 60 its fine but when slowing down comes on and off. just on take off the jurking holding back is a problem but there is times it doesent jurk but most of the time it does i had this problem for a some time then it just stopped, light on dashboard stayed off car run good for couple o months but then this all started again it is just anoying when taking off and when sitting at lights when it is reving up and down maybe just a small problem hope someone can help on this i have explaned it best as i can.