[jssgmcdiesel]

My lly wants to surge a little at idle-any thoughts on what it could be

 

[Johnasara]

Fuel pressure regulator.. Or FPRV they make a shim kit for them. Not sure if it is fix for it or if it needs to be replaced. I am sure other LLY owners will chime in, as it is a pretty common problem

 

[mijdirtyjeep]

Fuel pressure regulator.. Or FPRV they make a shim kit for them. Not sure if it is fix for it or if it needs to be replaced. I am sure other LLY owners will chime in, as it is a pretty common problem

X2 my FPR is bad and surges as well, just to lazy to fix it

 

[BIGON]

Mine has this issue only when I'm in gear it's not bad but i can feel it sometimes when at a light. Parked at idle it's fine.

 

[GMTech07]

X3 Fuel pressure regulator

 

[bluebowtie]

Mine does this too now I know what to do about it. Thanks guys

 

[midieselguy]

Mine has been doing this as well for some time. Does anyone know roughly what this should cost to be done?
What if I don't take care of it? What could happen?

 

[Big Daddy Braddy]

would this act similar to a bad throttle position sensor? do these trucks have a TPS?

 

[Newman1415]

I may have this symtom too, but not sure, what does it sound like or do?