NGK Iridium plugs, are they suitable?

[enthuzed]

Digging this up again as I've been mucking around with spark plugs and playing with NGK products again (yeah they do ignition leads) and finding the vehicle mis-firing under heavy acceleration. In my travels...

From: http://www.ngksparkplugs.com/techinfo/s ... sistor.asp

Frequently Asked Questions

Q: When should I use a resistor spark plug?

A: NGK "R" or resistor spark plugs use a 5k ohm ceramic resistor in the spark plug to suppress ignition noise generated during sparking.

NGK strongly recommends using resistor spark plugs in any vehicle that uses on-board computer systems to monitor or control engine performance. This is because resistor spark plugs reduce electromagnetic interference with on-board electronics.

They are also recommended on any vehicle that has other on-board electronic systems such as engine-management computers, two-way radios, GPS systems, depth finders or whenever recommended by the manufacturer.

In fact, using a non-resistor plug in certain applications can actually cause the engine to suffer undesirable side effects such as an erratic idle, high-rpm misfire, engine run-on, power drop off at certain rpm levels and abnormal combustion.

This page is very informative too...even if it contains spelling mistakes:
http://www.ngk.com.au/spark-plugs/techn ... g-analysis