Lopy idle

[Brandon15]

Hello, I recently replaced the FPR on my 2003 duramax and it cranked up and ran fine until about 5 minutes later it developed a lopy idle that comes and goes. Any ideas what to do or check?

Thanks,
BG

 

[BobbyBDirtyMax]

Did you replace it with one for an LB7 or a newer one from LLY and on?

 

[Harbin_22]

Did you put an LB7 or LLY FPR in it or did you go with one from an LBZ/LMM?

 

[Harbin_22]

Treed

 

[BobbyBDirtyMax]

Treed

 

[Brandon15]

I'm not sure. I gave them the vin # and it was sent to me.

 

[pullsanything]

Monitor your rail pressure(desired/actual) to see if it is fluctuating?