Question about 1994 Pontiac Grand Prix

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1994 Pontiac Grand Prix 3.1 Hi The engine starts & runs for about 2 minites then it wants to stall if you step on the accelerator hard it will stay running If I unplug the Throttle position sensor it will run fine at an idle I tried a different Throttle position sensor & it still wants to stall could the map sensor be the problem? Randy

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  • Randy Kruid
    Randy Kruid Nov 09, 2008

    I tried the Map sensor off of my 1996 Monte Carlo 3.1 & put it on the 1994 Grand Prix 3.1 & every thing seems to be fine runs great & no check engine lights are on



    Randy

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Yes u are very correct the map sensor could be the problem.

Posted on Nov 08, 2008

  • 1 more comment 
  • mmechanics Nov 08, 2008

     the fuel filter could also be the problem. If it has been more than 12,000 miles u have to change it anyways. If it's been more than 20,000 miles then u take the IAC out, as per auto manual instructions, clean it and put it back in. 
    Hope this helps.
    thanks.

  • mmechanics Nov 08, 2008

    Check for oil leak(s) underneath the car...this might be messing up your electrical connections.
    also Check the distributor.
    also
    the Exhaust Gas Recircuation (EGR)valve. A Malfunctioning EGR valve can cause 1 or more of the folloming syptoms: 1) Detonation, 2) rough idle or stalls on deceleration. 3) Hesitation or surge. 4)Abnromally low power at wide open throttle. 

    also
    Have your fuel injectors cleaned.



    thanks.

  • mmechanics Nov 08, 2008

    it could also be Ignition control module but before replacing that Check for fuel pressure and spark then go from there.
    thanks.

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