I started looking at leaning out my oil pump to see if it could clean up the low end bog that seems to have gotten worse lately. After getting a mirror next to my pump it appears it's set to stock Spec (rich) but what I started to notice is if I slowly squeeze the throttle from about 1/4 to 5/8 and let off slowly the pump will stick open. If I open the throttle all the way and let it slap close it doesn't stick. Kinda interesting if you ask me. I sprayed brake clean on the spring and worked the throttle a tons. Seems to be acting normal now. I did find a old thread where guys would zip tie the oil pump tabs together. Hope this works. FYI guys checks your pumps. 2014 m8000 1,100 miles and cat oil only.