The injectors were recently replaced and the valves adjusted to the proper specs. I took it to an experienced Tech who came with some good recommendations, he took off the cover and looking at the valves and injectors to make sure, and said it would cost more money to dig in deeper to diagnose. I hate the idea of putting hundreds of more dollars in it just to get a diagnosis. At this point, if I'm going to put money into it I'd rather be spending it on permanent instead of temporary solutions.