2002 GMC Sierra

13,000 MILES • 6 CYL • AWD • AUTOMATIC
Avatar
JUDI SMITH
  • MEMBER
  • 2 POSTS
when I press the accelerator it doesn't get any power. It started at about 50 mph and then drove at 20 mph and I thought it was going to completely quit. I pulled over and tried to rev the motor and made it about 1 1/2 miles to work at 20 mph. It has had a rough idle for a few months. When I would stop at a stop light it would die if I didn't apply both the brake and the gas during the stop. My truck has quadrasteer which probably doesn't make any difference but I thought I would mention it.
Jun 27, 2008 at 12:49 PM
Advertisement
Avatar
MASTERTECHTIM
  • ✓Experienced Mechanic
  • 4,750 POSTS
you need to have computer scanned for trouble codes, autozone does it for free, then get back to us
Jun 27, 2008 at 1:13 PM
Avatar
JUDI SMITH
  • MEMBER
  • 2 POSTS
Checked trouble spots on machine. It said massive misfire right bank; left bank fires normal.Changed fuel filter, air filter, and installed new spark plugs. Exchanged injectors from right bank to left bank; right bank still mis-firing. Fuel pressure from fuel regulator to injectors 50 PSI. Truck has Vortex 6000, V-8 engine, 325 HP, SFI fuel injection.
Jun 28, 2008 at 8:42 AM
Avatar
BMRFIXIT
  • ✓Experienced Mechanic
  • 19,053 POSTS
. . . Just a note to add !!!

what we find in them 6.0L engine is that the intake manifold gasket fails allowing unmetered air to enter the cylinders causing a rough idle and misfiring codes
DTC p0300 and or so
check the intake manifold gasket and replace it with the new TEAL GREEN GASKET MATERIAL
hope that help
if not the gasket check for injector pulse
Jun 29, 2008 at 12:09 AM
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Frequently Asked Problems for This Vehicle