rough idle, hesitates when accelerating on 2007 Hyundai Santa Fe

The problem started when the really cold weather hit, not sure that matters. The car cranks fine but idles rough after cranking. This last for a few seconds then its fine. When I drive off; however, it hesitates then suddenly surges forward . I had a new battery put in by the dealership and they also replaced the "upper vent valve" and did a "valve assy-purg". The problem was still there so I took it back in. Now they say its "Rod/Bearing with the #6 cylinder" so they need to replace the whole engine. Something about "accessive clearance". Thats a $7500 repair. Does this make any sense?

by in Rocky Mount, NC on February 09, 2011
0 answers