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1995 Suburban Lacking Power

Tiny
ERIC STEWARD
  • MEMBER
  • 1995 GMC SUBURBAN
  • V8
  • 2WD
  • AUTOMATIC
  • 217,000 MILES
I have a 1995 Suburban, 217,000 miles, 5.7 liter. It has very little when taking off. I replaced the plugs, plug wires, dist. Cap, rotor and checked the timing. In drive with the brake on, it has all kinds of power, with no hesitation. When I take it for a test drive, it will start off ok for about 2 seconds, then just completely lack power until you get up to speed and then it's ok. I'm baffled. Please help!

Thanks Guys!
Eric
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Thursday, January 28th, 2010 AT 10:58 PM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Here's where a vacuum guage comes in handy. Check wha tyou have, if you have only about 15" at idle then I would suspect a blocked exaust system, either at the down pipe(one that connects to manifolds) or the converter. An easy way to check is disconnect the converter and drive it.
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Wednesday, February 3rd, 2010 AT 8:39 PM

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