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International Automotive Technicians Network
Re: Rough Idle, Surging
Posted to HD/Fleet Forum on 6/14/2018

I can see the first capture not the second. Do the fuel trims skew +/- 10% off idle?

OE parts?

Fuel pressure tested, fuel sample taken? I have had bad fuel kick mt butt several times.

Pinch off the evap purge line when it's surging, to see if it changes.... Login to read more.