installed a lq4 with 223 232 115 custom grind cam in my 06 Silverado has mp112 3.2 pulley runnin 5 to 6 lbs boost also had headers had exact same setup on my 4.8 but no cam everything runs great except a idle surge will sometimes get as bad as 300 to 1200 rpm supposed to be 750 ive searched a lot and tried a lot I'm not too experienced with tuning I did my 4l80e segmentswap and tuning myself and few other things I actually had a pro dyno tune this thing does great wot afr is 11.3 just the surging I had him try to fix it but no luck I checked for any bad grounds or vacuum leak change spark plugs and have brand new wires did not make a difference I believe my issue is with tuning due to the bigger motor and big cam I have a thread on hptuners but not having much luck and am very new to tuning but I am welcome to any changes or ideas with in the lower RPM and idle

 

heres logs and dyno tune and a tried fix1

 

Who's doing the tuning on it?

 

u from tha bay? who u recomend

 

Another member from the Bay Area. cool. I'm in Pleasanton.

For surging, I would start with the RAFIG/RAFPN procedures. I think they are stickies on the HPTuners forum. Once you get your desired airflow right, you can soften the proportional and integral idle adjustments. Then adjust your timing corrections.

I use EFILive, but have a copy of HPTuners on my laptop at home. I'll take a look at your tune later.

Who tuned your truck?

 

thanks id appreciate it had mark romans do the dyno tune just so i could drive it forthe 2 months until my appt with the tuner that specd the cam

 

Not from the bay but Matt Gower of GPTuning is probably one of the best in the country. I use him for all of my build specs and his tuning skills are top notch. Not sure if you have seen "norcalss" 2k16 esky build on here but him and Matt are good friends and Matt does all of his tuning

 

That's funny that's who Specd my cam and that's who I'm going to have redo my tune long story short he told me most of my parts and I built my motor and set up an appointment to be tune but it was two months away so I decided to use another tuner in between so I didn't hurt the motor until I could get tuned so I guess I'm being selfish trying to fix it sooner knowing that in a little over a month I will have it redone I just really wanted to go to the track Wednesday but not if it's going to die after doing a burnout LOL yeah I've heard matt is very good I'm only at 5 pounds right now so I'm going to pull it down to probably around 8 and then have him just finish everything right

 

Honestly at this Point I've had the tune changed so many times and it seems to make no difference I'm starting to wonder if it is something mechanical it's totally intermittent I can drive it for 10 minutes and not have it do it at all then I'll put it in reverse give it a little time and it will idle up and down up and down pulsing me backwards wanting to die unless I hit the brake or give it gas so far I've changed the plugs checked the brand new MSD wires and tried my best to take some carb cleaner and spray it around the supercharger and vacuum lines with no change in idle and all my grounds and electrical seem to be fine

 

Did you try what last call said? Add some to the idle airflow tables. Both in gear and in park/neutral.