So, this weekend I installed my turbo kit onto my 03 impala along with my VCB. All is running well except my vacuum has dropped semi dramatically. It used to range from 7-22 now with the VCB/turbo it ranges from 5-11 during idle and easy driving. This morning I took the VCB off and placed my hand over the hole in the valve cover. While my vacuum increased to 20 ish, the engine died. Is this normal to lose half my vacuum?
I changed the stock 24# to 60#. My LTFT and STFT are -40 and -19 during idle and I suppose the vacuum has something to do with this. I am thinking the above issue has something to do with this but I know they'll need tuned in after the vacuum issue.
Any help/thoughts is appreciated.
Thanks,
Slim
