My missus' Tigra has been playing up for months.
Lumpy idle, hesitant, cuts out at junctions etc...
We have gone through it, changed a few sensors, idle control valve etc..
Took it to a garage who diagnosed the problem as a knackered EGR pump/system.
They have swapped the whole lot for a SECOND HAND effort from a corsa.
Symptoms are much better, but not 100%. My concern is that when you start it in the mornings (and sometimes when you drive) a very loud whining noise can be heard from the EGR pump.
Bloke at the garage said ALL TIGRAS AND CORSAS make this noise!! I KNOW THIS IS PAP!!
But please confirm, cos the missus believes the garage!! I know my Astra 1.6 16v doesnt do it!!