Hi guys, my 3dr keeps misfiring as its coming under load. It's only done 85000 miles, original engine, and I have out new iridium plugs in it, gapped from 0.6 mm down to 0.5mm.
The car is running stage 3, with t3 turbo and still has the antiquated dizzy and rotor arm system. I have a group a coil, with magnecor leads, new dizzy cap and rotor arm, but it still keep missing , only under load. Idle is sweet.
Been looking at the wasted spark system that msd has to offer, but does it really work? £400 seems a lot to me, but if it cures it, then I will be well chuffed.

Cheers