Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Hi. If the injectors were bad the engine would not run smoothly. You may have a problem with a sensor or the injection pump. Those still allow the engine to run smooth but go into limp mode. You probably want to have the computer checked for codes to give you a idea of what could be causing this.
The fuel return volume will vary depending on conditions. I do not know if putting spacers in will help anything since I dont know what is wrong yet. I would recommend at least getting the code checked in the computer to give me a direction to go. Since it goes into low power under load I would suspect not enough fuel. Injection pump or restricted filter. A scan tool is needed to check the desired and actual high side fuel pressure to see if the injection pump is working correctly.