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get a diagnostic scan. even if the check engine light is not on, a code may appear. also, some diagnostic tools can monitor the engine while it is running to get a better idea of how your car is running.

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17y ago
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Q: Why does my 1994 MUSTANG GT 5.0 HO BACKFIRE I JUST HAD SPARKE PLUGS CHANGE AND timing DONE. SO WHAT COULD BE THE REASON?
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