Question about 1999 GMC Sierra
The engine is a 5.3 liter. Truck wont start or has a hard time starting when the air temp is below 32. Sometimes the truck starts and stumbles at idle and will die doesnt matter what the air temp is.
When truck is under load sometimes it will stumble or backfire when you go to take off. this problem doesnt happen all the time off and on.
Try this, remove (MAF) Mas Air Flow sensor,(be sure key is OFF) so you don't set a trouble code when disconecting wire conector, with some throttle body/air intake cleaner from the outlet side of MAF, spray the sensor clean, let dry, reassemble.Remove snorkle from throttle body, and with a old tooth brush, clean throttle body& plate with cleaner, may take a couple of cans if throttle is badly 'coked' up. Hope this helps.
Posted on Feb 01, 2009
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Posted on Jan 02, 2017
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