I need help! The car idles bad and feels like it is missing when you give it gas, so we changed the spark plugs and the fuel filter, and the wires look good, now since we changed this stuff it still idles rough but is it still feels like it is missing when we give it gas. Like we where going up a hill and the whole way up the hill it would hesitate. Can any one give me advice on this? Thanks in advance:12dunno