My dads 03 idles at 480-600 when warmed up depending on the humidity and air temp. What is yours idling at?
Ya but it use to idle higher and when you put truck under load it seems like it is too low to be normal. My wife even asked whats wrong with the truck.lol I just checked fuel pressure that comes in at 55psi and I had a 1yr warnaty on mass air flow so I replaced that. While I was there I decide to get new plugs and wires seeing that i just passed 90,000 and I having a issue.
When put in drive or reverse from park it will come close to dying but will stay running?
2003 GMC Sierra 1500HD 4 Dr SLE 4WD Crew Cab SB HD
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Maintenance & Repair
The truck has been sitting for over a year
2005 GMC Sierra 1500HD
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Maintenance & Repair
Truck idles rough p0171 p0174 lean on both banks. It is need to know what will fix it. I had what if to the point is collaring me to death.
2006 GMC Sierra 1500HD SLE1 4dr Crew Cab 4WD SB
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Maintenance & Repair
I have replaced the wires and plug and check engine light has not come on. I put ona code machine. It said the mass sen. Was bad so I placed it run like a new truck. Then the check engine came on ...
2006 GMC Sierra 1500HD SLE1 4dr Crew Cab 4WD SB
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Maintenance & Repair
I have a 1999 GMC Sierra 1500 and recently had the front/Rear-end gears changed from 3.73 ratio to 4.56 ratio. Afterwards the ABS and brake light started coming on after about 2 miles drive time. It w...
GMC Sierra 1500HD
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Maintenance & Repair
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