Car stalls under low throttle & heavy load (uphills)

[myRed240]

Ok guys, I've been battling this problem for some time now:

When driving up hills at low throttle my car hesitates and more often than not it stalls upon release of the throttle. The idle is near perfect, except for a cyclic hesitation (rpm drops by 100 max)

Under any other loads the car runs nearly perfect, a/f's are spot on with the occasional fluctuations . I thought changing the plugs would help and it did, for a day.

I asked everyone on this forum to look at my plugs to evaluate whether I was running rich/lean/stoich. Most everyone here said the plugs looked good(which was my impression).

At idle Vacuum ~ 19.8-20.5a/f~ 14.7-17

Besides a boost leak, can an exhaust leak cause this? Occasionally the bolts from turbo to dp loosen up, but tightening them doesn't completely

My set-up:

Auto TrannyEnthalpy tune Walbo fuel pump555ccZ32 MAFBKRE7 gapped to ~.033GReddy RS bov (recirc'd with largest fitting)AMS GT32JGS manifoldAEM widebandAEM Truboost controllerAEM oil pressure gaugeZ32tt fuel filter

Input?

Suggestions?

Questions?

-Alex

[frsh13]

Do you have the bov on the cold pipe or the hot pipe? How do you have your IACV hose routed? And do you have a fuel pressure regulator?

[myRed240]

BOV is on hot pipe. IACV hose is right next to the throttle body. No fpr.