Hello everyone. I have a Nissan ud with the hino jo8e engine. 285k miles. The truck has been great. In the last few weeks on occasion (3 times so far) when I start the truck the exhaust is noticeably louder and sounds like a leak somewhere and it also has a dead throttle pedal. Push it to the floor and the rpms only go up 100-200 rpms. I can turn it off, restart and everything is normal again. Quiet exhaust and normal throttle pedal. Has anyone experienced this? Thanks