Check engine light and stop engine light come on momentarily at higher revs.

Hi guys, I need some help diagnosing a problem. If you guys could lead me in the right direction I would greatly appreciate it! I have a 2011 Kenworth T800 with a C13 Acert engine with a 10 speed transmission. The check engine light and stop engine light come on momentarily for like a second or two at higher revs (if maintained for a few seconds at around 15 rpm or higher) and turn off when I let go of the accelerator. Tried pulling the fault errors on the onboard system but it pulls no error codes. The truck works in the dump industry with a lot of dust and I don't know if feels kinda sluggish at times like something is blocked or restriction somewhere. I have changed engine air filter last month. I noticed the problem last year during the last week of the season, driving on the highway on gear 10 couldn't go faster than 60/65 mph without both lights coming on. This year, I've been to the yard to turn my truck on a few times in this cold Chicago weather but had only driven it like 3 times a short distance to a mechanic for fender installs and minor work like that not involving the engine with no lights coming on. Last time driving the truck was last friday (2/2/24). Today (2/5/24) I decided to go for a ride hooked up to the trailer to go get both truck and trailer inspected for annual safety inspection. After letting the truck warm up about 20/25 minutes, I couldn't leave the yard without both lights coming on even at low gears but still at higher revs (15 rpms) but both lights turning off as soon as I let go of accelerator and revs go down. Parked the truck turned it off and back on engine sounded better. I was able to leave the yard and went for a small ride in the vicinity of my yard. I was able to get up to 10th gear when the lights came back on momentarily at around 60 mph at 15rpms. What is going on? What can be causing this? What are some things I could check out? Any information is highly appreciated! Thank you!

 

oil pressure was around 20/25