Sputtering and missfiring at low RPMs

Tiny
TV8JUNKY
  • MEMBER
  • 2003 GMC SONOMA
  • 4.3L
  • 6 CYL
  • 2WD
  • AUTOMATIC
Ran great earlier. Then hard to start. When it does misses badly at low rpms up to 2500 rpms. Hesitates and sputters smells a little like sulfur. Runs better a higher rpms but when you stop it idles good but when you hit the gas sometimes stalls but you have to feather the gas pedal to get it to go.
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Friday, February 14th, 2014 AT 2:06 PM

1 Reply

Tiny
OBXAUTOMEDIC
  • MECHANIC
  • 3,711 POSTS
Hello,

The Sulfur or Bad Egg smell it a good indication of a clogged catalytic converter. If you are able you can disconnect the front side of the cat and start it up, if runs normally then have cat replaced.
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Saturday, February 15th, 2014 AT 3:54 PM

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