Question about 1990 Ford Tempo

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Runs great in park, when driving it will run smooth for a while and then loose power and slow down then all the sudden it will kick back in and come up to speed. Will do this at all speeds and in cruise control mode as well. All spark side system replaced as well as fuel/air filters and all cracked vacuum lines. I am stumped???

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  • skip_derbonn Sep 07, 2010

    no, check engine light will sometimes come on but will reset while driving

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  • Ford Master
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Have the fuel pump tested, you may be loosing fuel preasure, the only other things i think off is the control module and the coil itself, you have tuned it up so the first is the fuel preasure, make sure to put engine under a load for a few minutes or drive with the gauge and get the car to loose power as you watch the preasure if it looses preasure then you know its the pump if it acts up and preasure is stable thenmove on to the module, some part stores can test it for you, have it tested a few times to heat it up, if that tests good then i would try a coil. hope this helps.

Posted on Sep 02, 2010

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Map sensor

Posted on Sep 02, 2010

  • skip_derbonn Sep 03, 2010

    map sensor replaced still same problem

  • ricks auto tech Sep 03, 2010

    does the check engine light stay

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