Hi You do not say how many miles on the veh,it could still be covered under warranty,if not follow ellingtons advise and have some one run an air pump test under activations with a good scanner while watching the readings of the o2sensor if no change back track the system,could be a switch oner selenoid,vac leak,problem with the wiring harness,or clogged air ports.I would have it repaired,cause dumping cold start fuel and loading up those convertors may end up being costly.Joeym