mk1 1.2 16v elx.rattle noise

engine rattles at 2500rpm.below or above noise disappears.sounds like heat shield loose,have been removed.exhaust checked no loose baffles,etc.noise
is all around the downpipe,sump.gearbox.area.starter motor is noisy when starting car.something is vibrating at 2500rpm.but what can it be.thanks
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