Yes they do at the intake manifold gaskets.
Can be leaking intake manifold gaskets, which can sometimes be fixed by using Dexcool coolant. Can also be a head gasket.
It is located on the intake manifold near the thermostat housing.
back of the intake manifold ...back of the engine center top
a bad head gasket or intake manifold gasket.
Intake manifold, near the thermostat housing. Should have two wires.
Try cleaning the intake manifold.
bad vacuum hoses or leaking intake manifold gaskets.
what about it?
Remove the intake manifold retaining bolts from your 1996 Chevy Astro Van. Remove the manifold gasket and clean the surface. Reverse the process to install the new intake manifold gasket.
There is no difference,,,
yes
Assuming this is a 4.3L engine, the upper intake manifold gasket would be between the upper intake manifold and the lower intake manifold.