when my IAC was bad it would make the rpms go up and down like crazy but once the truck got started it wouldnt shut off. im not saying that the IAC isnt the problem im just saying when mine was bad it wouldnt cause the truck to die.

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2004 ford ranger 2.3 2wd. flowmaster 40. sony xplode head unit. 30x9.50x15 turbostar ATs. stock jeep wrangler wheels, painted black. ebay taillights. few more cosmetic upgrades