I have a 2002 GMC Sierra, with a 5.3 V-8. In cold temperature, when I first start my truck, it immediately idles up to 2300 rpm for about 3 seconds, then drops to about 700 and idles really rough until it warms up. It does set trouble codes--lean mixture both banks, and multti-cylinder random misfire. I'm concerned about it idling so fast before it picks up oil pressure. Any ideas?
have the same problem?
Wednesday, December 8th, 2010 AT 3:04 PM