fire up vs stir up

fire up and stir up both are verbs.

Word	Noun	Adjective	Verb	Adverb
fire up	No	No	Yes	No
stir up	No	No	Yes	No

As verbs, fire up and stir up are synonyms defined as:

Other synonyms of fire up include heat, ignite, inflame, wake.

fire up (verb)	stir up (verb)
begin to smoke	provoke or stir up
arouse or excite feelings and passions	change the arrangement or position of
	arouse or excite feelings and passions
	try to stir up public opinion