1996 GMC Sonoma Logo

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paul schaffner Posted on Oct 08, 2008
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When i start my truck,it goes to 4000 rpm and stays, and does not go back down

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  • Expert 183 Answers
  • Posted on Oct 08, 2008
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Joined: Aug 03, 2008
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Check for binding throttle cable,out of range throttle position sensor,sticking throttle plate and retreive any stored trouble codes...Good Luck...

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Rpm are way high. at 60 miles an hour the overdrive kicks in, rpm shoot up to 4000

Either the torque converter isn't staying locked-up
or your in third gear,not od, as you suggest.

In OD, which is fourth gear, rpm goes down, not up

So you know you have to go to a trans shop

Drive it like that one more day & you will ruin it,
as I suspect may have happened already
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