Slow

Tiny
BADBLACKSIERRA
  • MEMBER
  • 1999 GMC SIERRA
  • V8
  • 2WD
  • AUTOMATIC
1999 gmc sierra slow acceleration
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Saturday, July 23rd, 2011 AT 6:22 AM

4 Replies

Tiny
SATURNTECH9
  • EXPERT
Do you have any codes?Have you ran a exhaust back pressure test yet?
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Saturday, July 23rd, 2011 AT 6:35 AM
Tiny
BADBLACKSIERRA
  • MEMBER
Exhaust pressure is fine, no trooble codes at ell, just very sluggish acceleration, I think its either a clogged fuel filter, or a ignition problem, wires, coils, cap and rotor, I put lucas octane booster in it and it has just has a synthetic 10w30 oild change the truck has 400K on it and she's still going strong this has just recently started where she has become extremely sulggish and is lacking power
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Saturday, July 23rd, 2011 AT 6:43 AM
Tiny
BADBLACKSIERRA
  • MEMBER
The truck aslo has a Cold Air intake on it plus a few other performance mods, I'm not really an amateur when it comes to cars I have been working on them since I was 7 years old, I'm going to replace the plugs and wires see if that's the problem as I was going to be purchacing MSD complete igniton for it anyways, also I'm going to replace the EGR valve and fuel filter as I haven't replaced those in about 3 years, it could also possibly be an bad o2 sensor as well it looks to me like I might have a bunch of replacing of small parts to get done, oh well an afternoon with some beer and music it'll get done!
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Saturday, July 23rd, 2011 AT 6:50 AM
Tiny
SATURNTECH9
  • EXPERT
Ignition problems wouldnt cause a lack of power they cause missing. As far as the fuel filter goes you see if its restricted by removing it and blowing thru it not with a air compressor it should flow freely. So have you gotten any where replacingall those parts?
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Monday, July 25th, 2011 AT 3:50 AM

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