so my gf has a 2002 cabrio gls, its an automatic, has about 75000 miles on it, up to date oil brakes and all that stuff...recently changed plug and wires...the car runs perfect as long as its sunny outside..the problem is whenever it rains or goes through a puddle, it starts a rough idle, shakes, and dies...Replaced the distributor cap, thought it might be cracked but still nothing...any help would be appriecated...
Thanks

 

The ignition coil is bad... Very common problem

 

thanks, is it hard to change? never replaced one...