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  1. 4

    89 Mustang Backfires And Loads Up

    Thank you toolow! So what should i do? Im having trouble finding what the "evp" is? Would that be the egr valve sensor?
  2. 4

    89 Mustang Backfires And Loads Up

    I apologize for my incorrect puncuation and run on sentences ! I will try to do better!
  3. 4

    89 Mustang Backfires And Loads Up

    34 and 41 not running 21 41 91 engine runnning
  4. 4

    89 Mustang Backfires And Loads Up

    Its showing me 21 41 91 if i read them correctly it did rev up and down and flashed 4 times in the begining
  5. 4

    89 Mustang Backfires And Loads Up

    My car is pretty much stock with the exception of long tube bbk headers and off road h pipe... I put the car together using a california car so it has the a9s computer i removed the smog pump and ran a shorter belt bent the tubes over on the back of the heads and sealed them the best i could...