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Have a 98 gmc 6 5l turbo that keeps revving up and down when driving idles fineHave a 98 gmc 6 5l turbo that keeps revving up and down when driving idles fine
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check for a leaking fuel rail,or injector,or the fuel pressure regulator,which is a vacuum operated valve at the end of the fuel rail.the high idle is caused by a vacuum leak,and if the regulator is leaking,that could be the fuel smell
do you have the seal for the tank properly installed kinks or collapsed fuel lines and properly tightened? did you bang or drop fuel pump?good places to start!
Have a 98 gmc 6 5l turbo that keeps revving up and down when driving idles fine
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