So i have this 09 silverado i did a 418 build on.
236/246 109 lsa 107 icl 625 lift on both i/e
holley hi ram
NW102tb
60 # injectors siemens ev1
AFR 230cc big bore heads
compresion around 11.2:1
Truck drives wonderfully, and idles perfectly fine in park and in reverse and in drive.. does NOT surge one bit whilst idling or moving, etc.
The issue is that the truck just shuts off completely when putting the selector on park or neutral after being on drive. I experimented and determined that if I go to D or R in the selector then wait 1 sec and immediately go back to park or neutral, the idle is almost unaffected. But if i put the selector in D and apply the brake for about 5 seconds or so and then go back to Park, the truck just shuts off completely. There are instances when it wants to catch and then it surges for a good 10 seconds and catches but almost 100% of the time the truck just shuts off.
Any ideas on what it can be? ill be attaching a log of when the truck shut off and the hpt file.
I tried everything i could think of. Even touched some idle tables i never have before and nothing worked so reverted back to most of the factory tables besides the obvious tb scalar tables and rpm and airflow tables.