Hmm I 'll give it a stab
Since you are sure those are 24# injectors
If the fuel pressure is not set right, this will cause them to flow way too much fuel per duty cycle. The computer has a minimum cycle time for idle, and can't turn down the fuel flow enough to stabilize the idle. I also wonder if those injectors are just too large for that motor combo, kinda like running a 850 DP, larger aint always better. Maybe it would run better with the 19# injectors???
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Frank W
90 5.0 LX coupe Stone stock soon to be daily driver
74 Chevy Laguna Type S-3 305 apart in garage, getting a 454 to put next to it
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