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What makes a 1999 Grand Am run rough and flash the check engine light on and off?
Wiki User
∙ 10y ago
Severe emissions problem. Fix this ASAP.
To dig a little deeeper into the answer, It also may be a lown head-gasket. I recommend using a friend that knows alot about cars and buying the parts used. Letting a motor repair shop do it can cost you around $1,400!!!!!!!!
Could be a Sticky Egr valve. Replace or clean.
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If the check engine light is flashing , that indicates that an engine cylinder
misfire has been detected . You can drive the vehicle in for repair , just avoid any
rapid acceleration or deceleration because you can damage the catalytic
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Wiki User
∙ 10y ago
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