Matiz was stalling for past year at low revs and junctions (intermittently). Then starting jerking, misfiring and stalling constantly. After 4 garage visits I have paid out £800.New leads and plugs, new petrol tank, new cat and front exhaust. Cleaned Iac valve. New map sensor has cured the problem of the misfiring and jerking after stalling, but car still stalls (just once) everyday but starts again with no problem.Just before it stalls, very audible rattling from exhaust gets louder. I have been assured this is not linked and its just something (stone) in the box. I am not so sure. This is now my last attempt at sorting it before I send it to scrappies. I love my car and apart from this stalling, it runs well, and only 44k on clock.Should I try a new Iac valve as last option?? Diagnostics does not bring up any problem. About to give up..