I had the radiator flushed today. I do not think they put any stop leak in there at least they didn't tell me they did. I did have them put the flushing additive that removes supposed buildup and then the after additive that supposedly preserves the coolant more. The car is doing another weird thing now. When I am at about 50 to 60 mph it seems like it kind of shakes or vibrates. I just had new tires put on it, an outer tie rod end, all balanced, and an alignment done any ideas? Also, when I am at about 55 or 60 with the cruise on the car seems to jerk or kind of hesitate every once in a while any ideas on this as well? Thanks for the help. Btw I just put new plugs in at (properly gapped), checked the plug wires, changed the oil/filter, and new air filter. | 
