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Originally Posted by teckenroth
I've read other posts on the LHS and noticed a lot of comments about Intake Manifold gasket leaks. Would a leaky gasket cause the MAP to drop it's voltage signal? Would a leaking gasket also cause a rough engine but not display an error code?
Thanks to all for your help.
Timm
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A leaking intake manifold gasket is not just with LHS's it is usually associated with all models equipped with the 3.5 engine, in my experience it feels like a dead miss in one or two cylinders when idling in gear and under very slow movement of the car but usually smooths out at off idle and when accellerating or cruising I would very lightly spray around the gasket areas of the manifold and plenum with Carb Cleaner to check for leaks and usualy are around cylinders 5 or 6, also check all the vacuum lines for cracks or breakage as this will definitely cause rough idling. As far as it causing the MAP voltage to drop, I suppose it's possible, never tried it.
If no leaks are found you might want to try some injector cleaner in the gas tank as one might be sticking, also how long has it been since the fuel filter was last changed? That may cause a stumble or surging especially when cruising.