Good day, I have a 1999 Isuzu rodeo v6. the check engine light and check transmission light came on and been having a slightly rough shifting on the third gear a while now. so I went to change engine oil and transmission oil and filters but light was still on. So ran a test and it gave a transmission solenoid code so I changed the solenoid and light still stays on and third gear still does not shifts smoothely. Does anyone know what could be the problem?