My son has a 98 Escort ZX2. Bought it with 125,000 miles. now has 150,000 miles. I am trying to help him fix the vehicle. He came home and said that the SES light came on and the acceleration was an bogging. I checked the codes and he had P1381, and P1383. After reading some of the other advice, I asked him to get the oil changed, then we would clear the codes and see if that worked. He had the oil changed at Oil Express. He said it seemed to run better. We cleared the codes and they stayed cleared for 2 drive cycles. Then the P1383 came back, but the P1381 is gone. The car is still idling rougher than usual and even stalls sometimes at idle, but starts right back up. It also bogs down right before shifting but he can press more on the accelerator and get it to shift and then the engine comes back. I am going to drain 8 ozs of oil and add 8 ozs of Seafoam, clear the codes and hope it is something that can be cleaned with the Seafoam additive. Does this sound like a good start? If the codes remains, what should we do next?