sr20 help out of ideas

[turtle180]

i have an s13 blacktop sr with an gt2871r and 550 injectors tuned on power fc. i had it tuned mad 301hp and i have been havign an issue with high voltage so i replaced my alternator and after the tune i took it out on a drive and it ran way rich and back to a crappy idle that goes rick to lean randomly even after my tune and after the car made good power. no idea why the car wont run right i put 2 new mafs on the car and the alternator fule filter spark plugs, is there any way that the over voltage could have fucked something up causing it to run like this??? have no o2 sensor and the wire to the ecu and the feedback turned off on the power fc so it cant be getting any kind of signal from o2.

[cotbu]

Post a video.

[fliprayzin240sx]

So you killed the power on the car right? Did you double check the PFC and make sure it didnt drop the tune? It doesnt happen oftern but I've heard of it happening for some reason or another.

[turtle180]

i didnt unplug the power fc but it just dropped right after the tune and i took it back to the tuner and he said the tune was still there and it has constant power

[Uncivil240]

What about your plugs and coil packs , have you checked them? Checked your gap and coil resistance? Also as far is gain, set gain what are you sitting at. What kind of fuel pump are you running? I would also check the wires on the harness itself and check the ECU.

[Mr.GT30]

Voltage can possible effect injector lag time,, what is you voltage on you old VS new alternator if there different , it will have effect on lag time

[turtle180]

has new plugs and coils look amazing has a miss as well