sperodic missing help please

[highlander112001]

still missing
if you stand at back of car when its idleing it sounds lumpy you get normal sound from exhaust plus in the background it sounds like helicopter blades going round

if you take oil cap off when running it dies right down put hand over oil filler perks back up again taken off all leads individually and engine dies with all of them

theres oil around 4 5 6 spark plugs

smells like its running rich

not burning oil

its a 325i sport south African import 89