which generation motor is it Mike, does it have an air flow meter?

Hey Pat, it's a 96 gen 3 3sgte.

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Hi Mike    Fixed yet?   If not a bit of a long shot is to disconnect and seal off at the inlet manifold isolating the whole vacuum line and brake booster.   It is more likely to be the igniter area though unusual that it doesn't misfire under load.    Cheers.

All fixed... for now, but doesn't make any sence! The fix doesn't match all the symptoms.
I replaced the ignition leads, as they were only my list of things to eliminate & it seems they were the problem. I'm not fully convenience as yet, even though i have done 200kms on it since without an issues.
I've think it may have another intermediate problem, so only time will tell. Cant start diagnostics until it rears it head again 😠

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it sounded similiar to what i had before ........ 

the result was stuffed ecu ....  dunno really