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Measure intake-manifold vacuum as you're driving, what's reading right before 1800rpms and it cuts out?
Also measure both AFM and TPS output as test. Voltage should change linearly and smoothly with no drop-outs or spikes. That will positively identify components as good or bad and you can replace/adjust as necessary.
Or you can randomly replace 110+ perfectly working parts with brand-new perfectly working parts and nothing changes.
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