94' Buick Century - Shifting Problem
Has anybody had this happen or any clue to what it might be?
I recently replaced the coils, wires, and plugs. The engine was running beautifully after I did. It has nearly 260,000 miles, no rough idle, and it had good power when accelerating. I say had because I began to notice a slight power loss, not much, about a month after the repairs.
Then this happened. I am cruising along at 65 and suddenly it feels like my engine slips gears, from overdrive to third. If I accelerate it does not shift. There are no strange noises and the slipping is very smooth when it happens. If I put my car in neutral while I am driving, turn it off and then start it again; after engaging drive again it shifts into overdrive correctly. It also seems to do it more on hot days or after driving it 20 or more miles. When I said I noticed it slightly lost power while accelerating, it is only in the gears above third.
I am hoping this is not leading up to a major transmission problem.
I also have an O2 sensor that has gone out. Do not know if this has had a factor in it. The engine still runs great besides this and I would like to get another year (more if possible) out of it before I decide to lay it to rest.
Any ideas or thoughts on this would be greatly appreciated.