I'm sorry but you need to give us some more. Is this the same bus you said the check engine light was on, on a previous post? What have you done: did you change fuel filters? Did you change the air filters? Did you use a scan tool? Did you perform fuel pressure tests? What are the oil pressures? Is this a HUEI fuel system? What is the engine mileage? Is it an electronic transmission, and does it have the ability to over-ride the protection systems if something is wrong?
