it was rear caliper. and even though i pulled on the tire to make sure tire was tight.. 3 lugs had come loose?. so not sure what happened or how. but spoke with dave at DDM- and they put a 85 miles on it before i took it. and i put another 200 on it.. so how or why they started to come loose? and adjustment on the caliper?. not sure (Dave mentioned maybe tire was not securely on to been seated properly) when rear performance brakes were done- usually doing tire put on hand tight first with lugs till snug, then lower on ground and torque to specs.
so i will keep him posted- just glad everything worked out and nothing bad happened with wife in slingshot
but as of now everything is fixed completely.
should be picking up today to drive back and will see what's up?