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98 blazer 4.3 revs up and down??

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Old Aug 2, 2011 | 09:03 PM
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Default 98 blazer 4.3 revs up and down??

need help! holding the pedal at about 1500 rpm in park the tack will go up and down, it does it driving at lower speeds too, already replaced a lot of new parts. thanks
 
Old Aug 9, 2011 | 04:15 PM
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Yours doing something similar to this??

http://www.youtube.com/watch?v=aOOvp..._order&list=UL
 

Last edited by Frog; Aug 9, 2011 at 04:19 PM.
Old Aug 9, 2011 | 04:47 PM
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A/C compressor kicking on & off?
 
Old Aug 9, 2011 | 04:48 PM
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Disconnect IAC, still do it?
 
Old Aug 10, 2011 | 06:47 PM
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throttle position sensor or idle air control valve maybe?? might want to go more into detail about lots of new parts
 
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