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I have a 90 5.0 that ive had for about two years its fulley built... its been given me some problems laytly its been cutting out and my rpms jump up and erraticly and some times back fires. I thought it was the fuel pump and fuel filter but i have changed both of them out and it still does the same thing... If anybody has any ideas please let me know
 

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1 st thing you need to do is find how much fuel pressure you have .hoe does the car run when its under aload when your getting down on it
 

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it may be the timing, check your fuel pressure, and if that does work, check the timing or the distributor cap.
 
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