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motor problem

i recently bougt a opel gtj from 1974 whith original 1.9 motor and solex carburator.
now i`m trying to tune the engine and i have a problem.

the motor is running bad in some cases.

this is when i drive at low speed (30mph) in the third gear and i accellerate, the engine starts to give a strange noise. it sounds like there is something ratteling in the engine. now when i consist in accelerating and the engine comes at higer RPM (above 3500) the ratteling sound almost stops.
when i start to drive and i accelerate normal/very slow, the sound is not present.
but if i accelerate quite fast, the rattling sound is heard in all gears.

had anyone an idea what might be the cause of this??
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