Rough Idle

I have a 94 limited lesabre. It is idling very poorly, but it seems ok when not idling. It is showing an error for mass air flow sensor but i got another one from a junk yard and it ran the same. A new one is $125 and i dont want to buy a new one if that is not the problem. What else could it be?

Memory eludes me if and where it is if a 94 has one, I would think so, but I would be checking the MAF relay and wriing.

Have you removed and cleaned your IAC (Idle Air Control) valve?

Thanks everyone, i ended up having it looked at and the computer had gone bad in the car. I replaced that and now everything is working :grinyes: