I've ran NGK iridium IX's with no problems.
Spark plug gap for the 7M-GTE is .8 mm or .031 in.
Ignition timing on 87-88 turbos is 10 degrees BTDC.
Ignition timing on 89-on turbos is 12 degrees BTDC.
Make sure you set BASE ignition timing by disabling the electronic advance.
To disable the electronic advance on 87 and later models, jumper terminals E1 and TE1 at the diagnostic connector.
Ever run a compression test on your engine?
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