misfire problem - please help!

[markster]

so I got a Ibiza 1.4 8v and when it rained heavily i got a misfire. I replaced spark plugs which were shot at and all seemed ok. A month later it started to misfire again in the rain only this time it is permanent now, even in dry.

anyone any ideas what would cause it?

thanks

 

[RichN]

plug leads, or supply of spark? another shot plug due to not resolving source of original problem?

Is it one particular plug? You could remove them one at a time, until you find the one that doesn't change the engine note or cause it to stall when it's not connected.

 

[markster]

I don't think is spark plug I've had them all out again and they look ok. With it initiating when its raining hard water is obviously getting in somewhere. I wonder if the spark plug leads are the next port of call, maybe coil pack I guess