1994 Ford Taurus 3.0 liter engine you just replaced your EGR valve and backpressure sensor because the exhaust line to the egr valve and sensor was getting so hot it was melting the sensor what else?
You need to find some kind of asbestos wrap or make a small
heat-shield guard to put on or around the exhaust line to the EGR;
thus preventing this from occurring in the future.
Your catalytic converter can have blockage as well which will
cause all these problems