Stumbling/breaking up around 4500rpm

[Manikbastrd]

So, I swapped a rebuilt throttle body into my galant, then found that the FIAV must have been bad on it, because I had idle surge. Changed back to the old one and now she Idles fine, however I now have what feels like spark blowout or fuel cut or something around 4500 RPM when WOT. No problems when not on it hard, and when I log it, link has no data for any knock, and I have checked and re checked for boost leaks, can't hold over 10lbs but I think that is because of the compressor I am using. I haven't changed anything besides the throttle bodies, and yet have this issue. I tried putting in some fresh BPR7ES plugs gapped around .025 and that did not help.

I didn't have any issue like this before so this is something new. I tested my coil pack and harness and they are both fine. Compression is 152-157 for all four cylinders, and I am definitely not running lean...maybe a little rich if anything. The only other thing I can think of that this could be is that I jumped a tooth in my timing somehow...but I feel like I would have other issues going on as well. If that is the case, would this explain why my boost doesn't hold very well and I get weird knock when trying to tune her?

I am really at a loss here. I am going to check my timing marks on the cams in a few minutes, but figured I would post up here and ask for help for other possibilities. Mod list is up to date.

Thanks in advance to anyone who has some advice.

 

[95gsxxx]

im not familar with your car but i have a 2g gsx... i would have to say you have a boost leak and without a compressor to hold at 20psi you wont be able to hear it. And or too much cfm causing the computer to pull timing ( reducing knock, running too lean) looks like you dont have a wideband so its hard to tell what kind of a/f ratios you are at under boost.

check again with a better compressor tightin up your ic clamps

try to run lower boost and see at what psi your car stats to act up.

 

[jbeaton9292]

well i dont know if its your problem or not mine did this and i had found in link my 2 step was set at 4500 and for some reason it never disengaged the 2 step so it was "breaking up" i set my 2 step up to 8k and it went away just a thought

good luck