Have this nice old truck and the idle is really inconsistent. It will bog, then over-rev trying to recover then hold idle for a few. And then repeat again... Happens more when engaged in D, especially at a stop sign or light. I have sprayed around the intake gasket with carb cleaner and no change. Injectors have been pulled and cleaned (supposedly) along with a full tune-up... New Oxygen sensor... The tuneup was farmed out to a mechanic who came recommended as I needed some seals replaced along with brakes.
Any ideas of where next to look?
Thanks
Carl