Instead of spending hours trying to figure out how to fix this I decided to ask my brick board experts :-) 1993 Volvo 240 wagon. Son in law was learning to drive our car. It's been sitting getting a clutch put in for a couple years (neck injury so long process ) and has had other parts replaced and swapped out with our other 93 wagon. Was running like its old 330 thousand mile self when the check engine light came on. He is getting an error code 2-2-1 and says there are no other error codes. We did recently swap out an idle air control valve as the other wagon had one go bad. But not sure that would be the problem. Error code 2-2-1 new clutch driving son in law so car probably has been going through the shakes of that. Ideas of where we should start?