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is your distributor vacuum advance? i forget....i never keep the L28 motor in there very long. as soon as it gives me a reason to pull it out...i do lol.
it could be your tip in throttle... do you have any kind of adjustability with the tune? if it is vacuum advance, that initial drop in manifold pressure may cause it to knock or not have enough timing.
it could be as easy as a bad tps, or the ignition timing being off. i'd probably start by checking those 2 things. it could be stuck/rusted up weights in the distributor, you could pop the cap off and clean it. make sure everything can move freely.
it could also be the maf adjustment. it's a 30 year old car, those springs get weak. i've had to tighten up the last 2 z's i worked on. obviously before you move it mark where you started, then try two or 3 teeth in one direction, see if that helps, if not , go back to your mark and try 2 or 3 teeth in the other direction, but DO NOT let the spring unwind because you will NEVER get it back adjusted properly i've been told. that warning scared me straight so i've never had that problem cause i'm extra careful, but it's not uncommon to pop the maf cover off and have to adjust the cog on the maf for those cars. i'd check the other things i suggested before you mess with the maf tho.
other things you probably wanna check are boost leaks, hopefully you've already done that tho.
anyways, i saw nobody offering any help, so hope that helps.
Dave
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