<prompt> Human: My sister does not have transportation currently. She has the means to make a car payment every month though her employment history has been a bit rocky but poor credit. Im the only one who can help her get transportation. She is looking to buy a 2014 vehicle for stability not having to worry about it breakingI have pretty decent credit. Id estimate around 720-730 last time I checked with flawless payment history. However, I already have an auto loan and looking to move into a house in the next 1-2 years. Im not really experienced in this area; AFTER telling her Id co-sign with her, I did some research and came to realize this would affect my credit score. Should have been obvious at first, but again Im new to thisSo shes coming over in 2 hours to go down to the auto dealership, fill out some papers, run my credit. But now Im scared and sick to my stomach. I want to help her out, but not sure if thisll ruin my credit. Any one have any experience in a situation like this?  <response>: If her credit history is bad it should tell you something... 