Way to lean at idle

[blowinsmoke95]

i just aquired the car not too long ago.. the original motor had a knock... then it locked up... i swapped it with another... both before and after the swap ive had this problem...

at idle and part throttle the car runs like ass and the uego shows lean off the gauge... but when boost hits, its runs like a raped ape... and afr's go down around 11's or so...

ive got a video of cold start and idle with a couple revs... sorry sound quality is not the greatest but it has a horrible miss at idle and part throttle..... new plugs NGK BPR6ES, wires, newish o2 sensor, everything is hooked up... MAF got pulled from a perfectly running car and is untampered with...and the car is in perfect time... if u need to know anymore then ask.... if it means anything, this was originally a A/T car... 390cc injectors, A/T fuel pressure reg., and TD04 w/ manual ecu

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[zhjiln]

exhaust leak somewhere, fresh air is getting to the sensor and causing the lean mix at idle..

leak at flex section maybe..

 

[blowinsmoke95]

then what causes the shitty idle and part throttle??? i've also had the maf unplugged and got readings... with the maf unplugged i read rich off the scale at idle but the misfire COMPLETELY goes away... i dont get it... do i just run unplugged and watch the WB or what can i do???

anyone please??? what can i check???

anyone have an answer??? i need to know, as of monday, this will be my daily driver...i've also been noticing that at when it first starts, the wideband shows ~12.5-13.5 then within like 5-10 seconds it goes full lean and the car misfires really bad...