more details would be needed in order to offer solutions/advice.
how did you put your sandwich together?
did you thread, pin or spray baste?
are you using a walking foot or hopping (free motion foot)?
are you starting in the center and working out toward the edges of the quilt?
are you smoothing/checking often to ensure everything is smooth & taut?
have you practice,practice, practiced on small practice pieces before starting on a whole quilt?
did you lengthen your stitch length a little bit & loosen the tension?
details on how you did these things and pictures of trouble areas will make it possible for people to offer solutions.