Hi 123888,
You've asked a rather broad question without providing any details. This question is probably best answered by an Admissions Expert (there's a Forum full of them on this site), but here are the immediate details that are likely relevant:
1) What type of MBA do you have?
2) What School is it from and what was the emphasis of your studies?
3) What Schools/Programs are you planning to apply to?
4) What GMAT score do you 'think' that you'll have when you apply?
5) What are the other aspects of your profile (work experience, background, etc.)?
While it's possible that some programs might not be interested in an applicant who already has an MBA, I don't see any immediate reason why having an MBA would be a 'negative' on your application. Obviously, the details do matter (as they always do), but you have to define as much of this as possible before anyone can really answer this question.
GMAT assassins aren't born, they're made,
Rich