Sounds like a bad maf, everything that youv'e described sounds like my car when i have blown off couplers on the road, and it takes every ounce of the car's energy to limp to a safe spot. Doesnt want to drive, Bucks and stalls. idles decently but once load is added it struggles.
Get another maf and test it.
Also is the sidemount recirculated? Ive heard them to be faulty and cause issues.
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Z32 with lq4 swap
Desert Street Scene || Dssevents.com
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