alfa 156 16v idling problem
hi, it's my first thread here. recently i got trouble with my alfa 156(2000) and it wastes me heaps of money.
my car idles at 1000rpm when it's just started, once the transmission is engaged and put the clutch in the revs goes up to 2000-3000 rpm then drop into 1000rpm and keep goes up and down. But during driving, everything is alright.
i sent it to my mechanic, he replaced a new air flow meter and throttle body for me, and it didn't improve. Then i changed the spark plugs yesterday, seems it doesn't work....
My mechanic told me it might be caused by the selespeed transmission, but he is not too sure though.
Did anyone have same problem? what should i do next?