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Solved! I finally decided to drop the fuel tank and see what was going on -- I was hearing a little more than just the whine of the Walbro. I just finished inspecting the pump and feed line from the fuel pump to the main line was completely disintegrated to the point of mush, glad I caught it...

Yes, good call. I need a good timing light anyways, lookin now on amazon as well as a good soldering set. Following this, http://www.supra.co.nz/timing.htm My car is a headache right now, throwing codes 24 and 31. I understand that my Apexi safc could also be the culprit for that. I need to...

I have finally got around to checking leaks. I had a couple minor ones, the throttle body is from a U.S engine & I fitted it to a J-spec engine that I put in it - it always had issues sealing properly, stock gaskets wouldn't work - I permatexed it to ensure a seal. My O2 sensor had a leak...

Thank you!

Agreed, intake leak makes sense. I have the original intake and inter cooler piping, I'm sure it's had better days. I presume anything that would bypass the afm, I.e. air leak, could/would cause this lean a/f rough running issue? I guess it's due time for hard piping in everything for the sure...

Hoping someone with a higher level of technical mkiii knowledge can help me out. I'll start with my issues and then post a list of my engine setup. This is a problem that seems to be getting worse. A month ago, my a/f gauge said I was running rich under throttle, now it's the opposite. I'm...