i had simulr probs & it was a boost pressure leak front the turbo outlet to intake (throtle-bodie) pipe, sorted its easy to fix, check all your boost hoses before other stuff!
i do hope your not getting the same problom as me as it sounds very simular!
my s12 wont start now but it turns over! but i suffered the same bad running probs at roughly the same rev range as you describe 1st
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