hi I have a 2011 aveo 5 with auto trans car jurks &boggsdown when pulling out from a stop I just changed plugs & wires & air filter no Improvement I get 26 mpg on my daily route of 175miles driveing between 45mph to 75mph on turnpike & county roads bought car with 31000 miles 4 months ago now have 50065 miles any thoughts on how to fix these problems ? thanks