Rough idel when cold
 

My 98 deville with 131,000 miles started to run rough when you first start it up in the morning then when it warms up it's fine, so i don't know if i should change the plugs and wires to see if that dose the job or if you guy's can think of anything that would cause this. Thank you.

if they got 130,000 miles it would not hurt but they are probably not the problem.

rough idle is probably due to fuel, coil, or intake issues.
pull codes and report back.