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91 mustang 5.0 timing

2048 Views 6 Replies 6 Participants Last post by  Smurf stang
im having a timing isue with my car when i put a timing light on the marks at an idle the mark bounces all over the placebutwhen i rev the motor up and keepthe rpmsup the mork shows perfect right were it is supposed to be and at an idle the car wants to die on me any help would be great and i have all ready changed the timing chain
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1991 timing problem

did you do any work that would throw the timing off at all?
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