What causes a car to stutter and have higher then normal rpms until it warms up?

Question

This is a 1991 3.0 v6 montero

Answer 1

stuck open egr valve, vapor recovery unit has a leaking bypass valve that is sticking.

Answer 2

if it,s a 91, it,s got a egr valve somewhere. also a throttle position sensor can do it too. if the gas pedal is sticking, it would do it all the time.

Answer 3

trottle position sensor will do this too if its defective....should have a "check engine lite" on or "service engine soon light"  or code telling you what the problem is.....im leaning on  that its the tps sensor