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car idle 3k then dropped to1k back and forth then died need help

97-gst

10+ Year Contributor
1,234
1
May 16, 2010
Radford, Virginia
noticed that my cars idle was going up and down up and down rapidly, thought maybe it was a vacuum leak or something but i looked under the hood and i left the cap off of the water so i thought oh maybe thats what was wrong, well i went to work the next day and my car just died, had it towed, its gettin spark to all cylinders, no vacuum leaks, its getting gas, i checked the ecu and it looks good, it was blowing a fuse but we fixed it, now idk, would maybe a cas or something cause this?
 

iugrad92turbo

Supporting Member
12,907
826
May 22, 2007
Kalamazoo, Michigan
Well thats where you should start for idle surge , what else do you think it could be, gotta start somewhere. IDLE SURGE is just that up and down.
 
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