I made a thread on here before about the idle problem on my truck ("Wandering Idle"). I've replaced the PCV, TPS (which was actually broke), IAC, and the O2.
I've noticed from driving that there is a difference from day to day on how the truck drives. Most days it runs lean, but some days it runs normal or slightly rich. It doesn't seem to be affected by weather.
The MAP sensor is working at the proper voltage. When I had the codes read on the truck, one of them was "lean exhaust bank one." The garage said this could be due to a leak in the intake manifold gasket. Is it possible that a bad intake gasket could cause a change in the pressure within the intake and mess with the MAP's voltage when running?
Any thoughts on this would be appreciated.