well a buddy of mine told me to try this trick.

i took a bottle of water and poured it over each injector while the car was running. when i poured it over the number 3 and 4 injector, the car spluttered and coughed. so i guess that means the injector rings are bad. ill change those asap.

could that also be the cause of my weird idling

__________________
Current
2006 E320 CDI, 57K bought at 67K "Liesl"
1986 190E 2.3-16, 198K bought at 56K "Brigitta"
1987 300TD (Chuggin Along), 292K "Friedrich"
1995 E320 Wagon, 200K "Louisa"

Past
1987 300SDL, (sold) 125K, bought for 1$ "Kurt"