tuning problem

[tsi2fly1991]

I about to give up on trying to get my 91 talon tsi fwd tuned I cant get my low mid high fuel trims to go up to 100 with out it stumble between 3000 and 4000 rpms i have to leave
them in the 81 % range for it to drive right I just replaced the 02 sensor because I thought that could be the problem but that didnt help my setup is maft 2.1 ver fmic blow thru setup short piping 16g turbo 2.5 inch downpipe 3'' cat back 255lph walbro pte 550cc
injectors mbc running 15 psi on 91 octane fuel does anyone no what i can do also Im not getting knock when i put them at a 100% it just has bad hesatation between 3 & 4k


please help

 

[Evil1gDsm]

check for boost leaks

 

[ltho98]

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[tsi2fly1991]

no boost leaks check all that I eliminated emissions Like taboo shows how too

 

[oddrob]

Is it running poorly at 81%? If at 100% it stumbles, and 81% it doesn't and theres no other problems, I'd leave it there. Its within the ECU's parameters for control. Also I've noticed MAF's tend to run lean between 3-4k. Its a good setup, but there are always compromises to modifying a car.