Hyundai accent 1.3 1999 "T" reg engine noises

recently noticed my accent started making a rattling sound when started, lasted all of 3 seconds then dissapeared. Decided to have it serviced and have the cam belt replaced and it was better for about a week. Now ive
noticed it has come back and sometimes lasts longer i.e 20/30 seconds, doesnt happen everytime you start it though and doesnt matter if its hot or cold. any ideas?
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sound like you got a lifter going bad
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