Question about 1991 GMC Sonoma

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It will start and idle.When you take off to drive it takes off fine then all of a sudden it looses power and wil not go.Its a stick shift.It has a new fuel pump,new tune up,and a new pick up in the distributor.

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  • 361 Answers

Change sprk plugs and wires

Posted on Aug 30, 2010

  • judystarrett Aug 30, 2010

    I did about a month ago

  • john_eaches Sep 03, 2010

    replace the o2 censor?

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Yes the computer uses TPS (throttle position sensor) and VSS (vehicle speed sensor) sensors information as well as fluid temp and other factors to determine shift points based on the info stored in the PROM (memory) IC chip, if it is not shifting then you either have a poor connection at the trans case electrical connector or a sticking shift solenoid inside the trans, I would pull the trans connector off and make sure it is clean and properly installed, look for a broken connector retainer as well, this is very common and can cause a loss of signal from the PCM (power train control module) module to the transmission shift solenoids. Most likely the 3rd gear shift solenoid is sticking off from sitting so long, had this happen on my truck, cleared itself.

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