REALLY frustrated. 1 Bank lean, 1Bank rich, rough idle

[ltmark]

2003 Expy, 186K

At road speeds, runs pretty good. A little hesitation accelerating. At idel, stumbles, wanders rpm. etc. NO CODES

OBD live data shows Bank 1 SHRTft within 7% + and - ,each way
Bank 1 Longtft +18 to +25%

Bank 2 (both normal range)

RPM's wander from 680 -720

New O2 sensors
No codes but occassionally pending codes showing bank 1 lean (P0171) and bank 2 rich (P2198)
MAF tested
New Pcv
New plugs
New Coils
Idle vacuum steady at 22 HG, with quick snap test reaction
fuel pressure OK

At idle, with EGR top small vacuum hose removed, I don't get any vacuum when pulling throttle open. Not sure if only vacuum under load when accelerating?? Shouldn't effect idle anyway!

I have NOT removed fuel injectors yet.

Seems odd that one bank lean and other rich.

I can't find any vacuum leaks. I would think that a vacuum leak would effect each side the same? Does the steady 22HG make a leak less likely?

 

[docraymund]

Ok so run the engine again up to normal operating temp and observe bank 1 long term ft. Increase engine speed to 2500 rpm, if the B1 ltft goes down, you have a vacuum leak affecting that side. Proceed to a smoke test.