yes.. iridium plug last upto 100 000km's ... so what if they cost you more right now.. if you work it out they are cheaper in the end liek the whole reusable cotton filter scenario...

the fuel filter nar thats pretty normal.. there not expensive.. thats why you should replace them prolly every 15 000K in an older car (scale and sediment in the bottom of the tank) doesn't hurt what soever serviceing and maintining your car as often as you can..

has this fixed your problem though??? or atleast made it a wee bit more responsive??