2005 GMC Envoy engine light & stuck speedometer

Tiny
BENBEN949
  • MEMBER
  • 2005 GMC ENVOY
  • 4.2L
  • V6
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
Hello, my 2005 envoys engine light comes on and goes off in a day or too. Its runs good except it idles rough. And now the speedometer is getting stuck so when im going 40 the speedometer is showing 70. I plugged it in to a scanner in and got code p0302 "2nd cyilider misfiring". How serious is this problem I just bought this truck. What are some simple things I can do to asses the problem before I take it in? Thank you hope u can help me
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Saturday, March 1st, 2014 AT 7:36 PM

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Tiny
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Id start with a tune up first for the misfire and running problem. The speedo problem is most likely not related and is probably in the gauge cluster.
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Sunday, March 2nd, 2014 AT 7:02 AM

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