Question about 1998 Pontiac Grand Prix
Is the check engine light on? If it is, take it to an autoparts store and have them use a scan tool to retrieve any fault codes stored in the car's computer. Most stores provide this as a free service. The code(s) will help narrow down the problem. Hope this helped.
Posted on Jul 19, 2009
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Posted on Jan 02, 2017
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Throttle Body Cleaning on vehicles without electronic throttle control (most 2003 and down)
You can in most cases repair this slow speed stall or unstable idle by cleaning the engine throttle valve and the idle speed control valve using a product called CRC Spray Throttle valve cleaner. Spray the cleaner into the air intake of the engine with the hose removed from the throttle body, the engine will try to stall so hold up the idle speed manually. Once you have used up about 1/2 can of the cleaner stall the engine out while spraying and turn the key off, disconnect the negative battery cable for 5 minutes and then reconnect and drive the car for a about 25 miles of varied driving modes. If this doesn't cure the problem you may need the fuel injectors professionally cleaned by the dealer service dept.
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