Hello Cummins guys! I’ve been having trouble with my 97 12 valve Idling. On a warm summer day, It idles at about 800 Rpm in P and N, it drops to about 750 when in D. If I drive it hard on the highway for a few minutes, especially if I hammer on the throttle a few times getting on the highway or passing, when I get off the highway and stop at a light it idles at 300 RPM or sometimes even lower and barely stays running. When I hit the throttle it idles up and runs fine, at least it seems to run fine. Sometimes it’ll stay idling like that for days even if it sits over night I’ll start it and it’ll idle very low even in P and N. I have a fuel pressure gauge and it doesn’t drop ever, my lift pump seems fine. I don’t know what to do. In the winter the thing never idles right lol but then again it’s always cold as hell here. Thank you!