ideling and turning off problem w/ my red top

[Id RaThEr DrIfT]

okay this all started happening lately hmmmm like a week or 2 ago and with In those 2 weeks when it all started i installed a nismo fpr and a hks bov i say that cause it might have something to do with it okay well first off.....
my car idels now and it never did that untill the fpr.... it stays still once the car is completly warm but if its cold it will stay at 500rpm and if i try giving it gas it will go up very slow even if i gas it hard untill it hits 2,500rpm then it will go up fast, If I decide to take off while the car its'nt completly warm , lets say im in 2nd gear in 4,000rpm and go into (N) the rpms drop quick all the way doiwn to 2-300rpm and then go back up to normal 700 but once the car is warm its okay no idel nothing .... is that normal?????? o also if i rev it right in the morning smoke comes out of my exhuast, is that normal?
Also for some wiered reasone my car didnt turn on today well i got in turned the key and there was no power at all no radio nothing, i moved the battery a bit and turned on right away, and for the past week my stereo would turn off and on, and my brake light inside is always been on but kinda turns off if i gas it hard my front turn signalls light up when i step on the brakes so yeah any help would be great!

[rotation3x]

sounds like some wierd electricla problems with your radio cutting out and you brake light staying on and the turn signal. I would check al the fuses get a fsm for the chassis wiring cheack and make sure none of the wires are grounding out.....(my friend has a 90 s13 coupe and he lost his headlights once because of one of the side marker lights wires came off and was hitting the fender.

for the engine problems id check your vacum lines to your blow off valve and waste gate make sure they arnt leaking cut or in the wrong place. check your 02 sensor connection and sensor. try checking your computer for codes to you can try unplugging your tps sensor if it runs better unplugged replace it. if your car revs up slow check your timing it could be a little off advance it some just a idea.

[pwhitersxs]

When you are driving your car and you put the car in neutral and the rpms drop...this is normal. Have you checked to see if your alternator is functioning properly? Is your fuel pressure at 43.5 psi or close to that? Checked for minor boost leaks?

This sounds like multiple issues btw.

[Id RaThEr DrIfT]

okay as of right now i dont even have a o2 sensor beacuse i replaced the elbow with a megan so the stock didnt fit so i have a screw to block iff for now and my fp is set at 38 w/ vacum so yeah ... also no codes and one minor boost leak on one of my vacume lines, and it only revs up slow between 1-2500rpm when the car is cold if its warm it'll rev up perfact and fast