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#1
03-17-2007, 09:25 PM
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1989 GMC Sierra...Elect. Spark Control
Again, more issues/problems with my truck.....ughhhhhhh.
 At highway speeds (60-70mph) the "check engine" light will come on. I pulled the codes and it gave me 32-egr issues and 43-esc issues. I think the esc is causing egr issues since I recently replaced egr parts. Also while driving city speeds (30-40mph) the tranny will shift up and down really fast back to back until you get over 40mph. Is all this possibly connected? Where is the esc module on my truck, should I replace it or look further into it? Last edited by vzfox; 03-20-2007 at 06:25 PM. 
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