The coil's might need to be changed if they havent been lately, on older ones look on the top surface on the coil and check for small cracks in the glossy finish in the centre, newer ones have a rough finish though. They might have non visible problems though. Need a multimeter to really check them.

get the bosch dual tip plugs from the dealer (or other place that has them), I know for a fact that if your coils are not 100% don't get anything else. Also Bosch platniums are a real bad choice(hesitation, missing, maybe even backfiring), the regular ones will run better.

we dont have spart plug wires....or timing belts....or spark plug distributing caps. our engines run on a coil system. all you'd need are the actual spark plugs. try bosch platniumns or NGK's. hope this helps

saeed
~333