Question about 2003 Pontiac Grand Am

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When I'm on the high way my grand dam starts to shake and won't hole its speed

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Hi!!
It seems like a fuel delivery problem. Let's start by replacing the fuel and air filter, check the fuel pump pressure, if you do not have a Fuel Pressure Tester, borrow one from AutoZone, Checkers or similar Autoparts store and ask for the fuel pressure range the pump should output. If your check engine light is on, have the computer scanned for Trouble Codes, this is a FREE service most Autoparts stores provide for their customers.
Also, check all the vacuum hoses for cracks and disconnected terminals.
Good Luck!! Keep me posted!

Posted on Aug 24, 2010

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Posted on Jan 02, 2017

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Three possible causes: (1) The high speed circuit in the radiator fan motor could be defective. (2) The high speed fan relay Could be defective. (3) It possibly may have a wiring issue. I've seen at times where you can wiggle the fan motor connector that's mounted on the fan shroud and the motor will kick on. If this is the case then replace the hole assembly which is a motor and shroud assembly. Hope this helps and have an awesome day.

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Sounds like you have a broken belt in one of your rear tires, or a bent wheel. This would feel like the car is rocking a little bit like a boat on small waves. You can check this out by lifting the rear tires off the ground a slowly rotate them while looking at the tread, if you see the tire really wobble or have a bump in one spot that's it.

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