usaevo8

I would like to know this answer as well, I have seen this behaviour (what the OP refers to and the post above) creep up recently. My car is full stock with ecuflash and lc-1 for testing/tuning. After dialing in the AFRs to 10-11 over stock im starting to see more vacuum and it drop off while lightly accelerating.

jakub

iTrader: (15)

this is normal, my car is the same way. Im not sure about the slow spool though

kouzman

iTrader: (6)

my car used to have 18-20 vacuum.

after the cams install the vacuum dropped to ~12 , always in idle...

now when in gear and lift the gas, the vaccum goes to -20 or more i don't remember exactly... That's completely normal...

laz1e

id like to know this as well. i know that the throttle body leaks a little bit and thats probably why it creeps back down to -20 when your in neutral and just hold a rev at 3000rpm. if not then maybe you have a leak.. which means i do too =)