So far, I've tried:

Replace maf sensor
Replace egr valve
Rebuilt the tandem pump
Swapped around the fuel temp sensor and coolant temp sensor
Rewired the fuel temp sensor
Smoke tested the boost pipes
Smoke tested all the vacuum pipes I can find

The thing still hates low speed/low revs. It stumbles and pig roots at around 1200rpm, otherwise runs fine.

Some days are worse than others, gets worse when hot.

What am I missing???

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