I have a 1994 cherokee 2 wd 4.0L inline 6 I have a check engine light at auto zone they told me how to get the error codes and I have 2 of them coming up 34 and 35 my car is surging and bucking I have changed the distributor cap new wires new plugs new fuel filter new thermostat and have cleaned the fuel injectors. I hope someone can give me some good advice where I need to go from here or tell me what these codes mean. Thank you very much