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Idle problems could be a lot of things.......even though you are hiting your fuel pump each time you have a problem it may be something else. If you think the fuel pump is sticking, try and confirm that. If it is, then it won't get any better on its own......start thinking about a new one once you are sure the wiring and fuel pump relay are both good. (check under the hood there are 3 relays that are well worth checking, and renewing and carry 3 spares in your glovebox) then put a tie wrap around each one as they can work lose)!
Idle can be affected by the smallest vac leak, so work your way through the engine bay and check each hose carefully. Some will need positive pressure leading to the throttle body.......so give the large elbow boot a good squeeze, remove it, clean it, inspect each rib and flexi section, clean up the throttle body too with some cleaner.
Check all the small bore vac hoses and replace them as they are cheap anyway.
The idle control vavle and the MAF need to be in good condition and cleaned with some carb cleaner
Do a compression test if you still think your plugs are fouled (when did you change them - or was that the previous owner......change and gap them and use the cheap copper core ones, rather than expensive irridium stuff that are 3 x the price as an E30 seems to like the bog standard copper things! If you ahve decent and balanced compression across all cylinders (about 140-170 psi) then go with it for now. If you are thinking of an engine rebuild, its a big job to do correctly and new rings and bearings are only the start of it unless you want to do it all again later (oil pump, gaskets, head bolts, main seal, rear main seal, timing belt, water pump, tensioner etc etc)
Having said that, if you intend to keep this E30 going, then find out if you can when the timing belt was last done.......they can snap and then you are in for a big repair.....change the oil and filter too!
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