Engine Noise

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hi guys just brought my 2nd mr2 as i missed my first 1 but this mr2 is giving me nothing but grief on the way home from buying my 2 i broke down and found out the bottom end had gone so i ordered a new engine stuck it in and i was back on the road, for about a week now its making a horrible noise when i start it and it goes after about 5 mins but when i rev it to about 2000-3000rpm the noise comes back it doesnt seem to affect the driving of it but it is just really annoying.