My sons Ram truck has a strange intermitent suction of air , through the throttle body (so it appears), the rpms drop and it runs rough ,trying to stall. It will do this and then for no reason ,just straighten itself out and idle fine. We checked IAC ,PCV ,intake bolts ,throttle body bolts ,and all vaccume connections. The fuel pump shows a steady 50 lbs.
I remember reading something here about the bottom of the "beer barrel" intakes having a steel plate rivited on.....Where they coming loose and creating air leaks?
I't's driving us crazy!!!