Hey how's everybody doin' I have a sedan deville had for about 3yrs. and got it with about 70,000 miles I'm up to 90,000 now. I've kept a regular oil change on it and have had one tune-up on it. Now comes the problems of irregular idling and car wanting to accelerate at full stops and while braking. I don't know if I should get another idler or a tune-up can someone please help.