1995 Suburban Lacking Power

1995 GMC SUBURBAN
217,000 MILES • V8 • 2WD • AUTOMATIC
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ERIC STEWARD
  • MEMBER
  • 3 POSTS
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
Jan 28, 2010 at 2:58 PM
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HMAC300
  • ✓Experienced 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.
Feb 3, 2010 at 12:39 PM
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