I have a 1992 Isuzu trooper 4x4. It has been in and out of the repair shop since april. They can not fix it. I was driving uyp a small hill when my trooper started cutting out. The o2 & check engine light came on. It barely made it up this hihll, very slowly. I took it into this place right away. I was told it needed a tune up and oil filter change. under $200.00 was my est. I got a call 2 days later and my bill was $340.00 and i came unglued. I took it home and it still was not running right, in fact it was worse. I took it back and they put new plug wires oin it. Same problem. I again took it in last week for the entire week and they have not fixed it yet! HELP ME PLEASE???