Good morning yall! First of all I have been reading on this site for a very long time now and absolutely love it! Just finally decided to become a member last night for some serious help... the Ole 7.3 idi has me stumped...I have a chuffing/poppingish noise from the intake . I originally thought it was a lifter going down causing a valve not to open completely . now not so sure...I have removed all lifters, took them apart, cleaned and replaced them. Still there. None of the lifters seem to pump much oil at idle or higher rpms. Getting frustrated. Double checked the valve guides on passenger intake side couple bad so replaced. Still there...getting good and pissed now. Need some help please. I've also checked injectors as well...I received a donor motor from a buddy that spun a main. So happy for that. Spare parts yes!!!