Weird intermittent problem, only shows itself after a pull.

[90 GSX]

I can't seem to figure this one out. The problem sometimes occurs out of the blue but I'd say a good 90% of the time is happens after a pull. The car stumbles, stutters, loses vacuum, and sounds like its chugging along. Hitting the gas makes the car move but it feels like I'm on 2 cylinders. On my datalogger it shows a very lean condition which indicates to me that it lost fuel or the spark didn't fire or something. Any ideas?

 

[kwAlk23]

Sounds to me like it's a very big boost leak. My car did that a while back and i came to find out that it was my stock 2g BOV that was leaking.
Also, are your spark plugs fine?

 

[44pirate]

Same exact issue I had. CAS went bad. Finally swapped that out and back to normal.

 

[90 GSX]

I also thought I had a huge boost leak but it turns out that is not the problem. The car holds without so much as a peep at 25 psi on my boost gauge during a leak test.

I tried 2 other CAS already. So that's not the problem.

Could it be injector related? They are RC550s, I'm thinking about sending them to witchunter or somebody like that for cleaning and flow matching.

 

[tkelly27]

That happens to mine sometimes. What fixes it is taking the connector off the coil transistor pack, clean it, and put it back on snugly. That cable is too short and likes to pull out. I dunno how to fix it permanently, there was a writeup on it on someones website that I lost. Mine always shows up in the CEL codes though.