Have an 89 deville 4.5 which I have been trying to solve the hesitation problem. Replaced EGR, cleaned EGR tubes and throttle body completely did not fix my problem. Now I get the following Codes E71, E72, E74, E76, E77, E78! Can someone please tell me if this indicates a bad MAP Sensor or is there something else I am missing? Car hesitates when I take my foot off the accelerator or try to give it gas. Idles terrible now!