I have a 91 Explorer I ordered the wrong computer. I ordered one for a 94 and well it loped at idle I found that out here, but it would take all of the gas peddle with no problem. So after I came here and searched the problem I got a computer for my 91 Now it wont Idle until it gets warm and its stumbling like it has a skip. I have Installed a new Maf,new plugs and the tranny has just been rebuilt. I had to put a new fpr due to gas pouring out of the exhaust. Just wondering the paper work that came with computer said the new computer will have to learn the sensors. I was wanting to know how long until it learns this and could my problem be with other sensors. I have a code reader and I am getting the code 99 computer Hasnt learned the system yet all help appreciated. I have also been Getting other codes also.