Idle help 5.3l

[castorjames]

Hello this is in a custom swap.

Engine: 2008 5.3L
Trans:2012 6L90E
MAF:LS3
INJECTORS:08 flex fuel injectors

Everything is working ok, im on the process of tuning it, but when it is idling in Park/neutral, the rpm will go up a litle then down, then up then down, any help to fix this??

Thanks everyone

[lukearmstrong1990]

reduce your overspeed and underspeed compensators for P/N and gear by at least half and see what effect that has.

are your idle proportional airflow values factory? if not put in factory numbers.

you could try reducing idle timing to 10-13 degrees

[castorjames]

thank you sir, i found DOD cam wast removed, just lifters and pushrods, replaced cam with non DOD cam and retuned and good to go

[jpierro79]

There is no DOD in ls3 that’s a l99

[castorjames]

There is no DOD in ls3 that’s a l99

Engine is a 5.3L, originally was DOD, pcm is from a ZL1 tho

[jpierro79]

sorry missed that part saw ls3 maf missed 5.3.