I have an 01 trailblazer. It has an aftermarket pipe and a clutch in it. I have tried every jet from 120 to 160. I think the stock jet is a 110, which i do not have at the moment. I can not get this thing to perform. 150 and 160 jet will not work at all. totally floods out. 140 and 130 seem a little rich too. 120 seems to look good on the plug but it seems to just run out of gas. I finally checked the compression. Hot with throttle open it read 104 psi with a reliable guage. Im thinking time to rebuild but I cant find the specs. everyone says theirs has around 120 psi. then i read a guy had one with 65 psi and just now hard to start. I'm lost. Any info is greatly appreciated. thanks.

vince

 

i think 130 is stock what kind of pipe is it

 

It is an HPD pipe. It's a complete exhaust.

 

Cold comp should be 100-110+psi