turbotime

I am trying to troubleshoot bad vacuum, i get 22" almost all the time but then sometimes for no reason itll go to 16-18". I have a 2.5" downpipe that has a 2" reducer on the end and then it goes to a full 3". Could the 2" reducer be causing enough of a restriction to trap the a/f charge and cause lowered vacuum?

Another thing i was thinking is the vlaves might be too tight, i mean its normal vacuum almost all the time then it will creep to 16"-18" i have no clue what could cause this can anyone help? Compression and leakdown are all good!

Please Help!

DeDonDeRosa

iTrader: (1)

BUMP cause i have the same vac prob with my jrsc'd gsr and vac gauge moves slowly idk why idles like a rock