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PostPosted: Thu Aug 23, 2018 3:10 pm 
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LE Member

Joined: Sat Dec 12, 2015 1:06 am
Posts: 9
Location: SOUTHEASTERN WA.
Year and Trim: 2000 SSEI BLACK 118,000 MI. , 2000 SLE
Hello again, it's been awhile. My past problem with the misfiring was eventually solved w/ coil replacements, but another one has sprung up. After starting the engine (2000 SSEI 3.8L) and reach operating temp. it will momentarily stall dropping to approx. 700 RPM then resume to 950 RPM. when driving it will repeat when accelerating periodically also. Any Ideas?


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PostPosted: Mon Aug 27, 2018 9:30 pm 
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SLE Member
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Joined: Sat Oct 28, 2017 10:00 pm
Posts: 65
Year and Trim: 2003 Pontiac Bonneville SSEI
Fist thought that comes to mind would be Throttle position sensor, but as usual, just a guess.

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2003 Pontiac Bonneville SSEI
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PostPosted: Mon Aug 27, 2018 9:54 pm 
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Certified Bonneville Nut
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Joined: Mon May 10, 2010 6:11 pm
Posts: 8942
Location: Chicago, IL
Year and Trim: 2003 SLE
Stalling implies 0 RPM. Yours is dipping down? Might be the fans cycling on and off. Mine does a similar thing sometimes.

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"Penelope" - 2003 SLE - 177k Miles
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PostPosted: Tue Aug 28, 2018 9:48 am 
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SE Member
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Joined: Mon Aug 27, 2018 3:08 pm
Posts: 10
Year and Trim: 2004 Buick Park Avenue Ultra
Have you ever changed out the fuel filter? How's your air filter? Just thinking basic first...does anyone know how a faulty PCV valve behaves? (curious for myself too)


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