What problems with failure of the Exhaust Gas Recirculation Valve Passages in the intake manifold in a tracker

Niki's answer is mostly correct, with the exception of "data flow to the ecm (or pcm, whichever you have). The "data flow" she is referring to is actually a 5V reference feedback from the EGR's pintle, which the ECM uses to calculate positioning and performance of the valve, no data is sent between the ecm %26amp; egr. If the passages to the EGR become restricted, nothing will happen except a service engine lamp. If the EGR valve gets stuck open, the the engine will be sluggish and hesitate, even stall out at times. Have the passages cleaned at a dealership. If the valve is sticking open, or if there is a restriction- your emissions will likely fail depending on the state you live in.|||The engine light will come on, along with a possible surging and or sluggishness when excelerating due to insufficient data flow to the ecm. Also the vehicle may not pass emissions tests and inspections in many states.