99 Lesabre shakes like hell on startup..

When I start my car in the morning and only in the morning it has very rough idle and engine light starts flashing then stays on for a couple of days.I checked the code at autozone and it said misfire or something like that.He couldnt really tell me what was causing it though.Anyway, it will be really rough for like 2 mins but then it will smooth out and you can hear it running better then I can drive it from there.Its only bad when I first start it and sometimes worse when its wet or humid outside.I know i need a belt really bad, would that have sumthin to do with it?Oh yeah, sometimes at red lights it will kind of stutter a little bit too,but only at idle.Thanks for any help

Check your spark plug wires for cracks or if they have been rubbing on the engine some where, my car did the same thing in the morning (especially when it was wet out) untill it warmed up turned out that one of my wires were worn through from rubbing on the valve cover.

ok thanks Ill go take a look at them..