Hi Guys

Bought a EM1 with what i thought was a stock setup (i like stock) , drove it now i notice a few things,
1. half tank only 150k's 98 optimax,
2. slight smell of petrol from exhaust.
3. sometimes cuts out kinda chokes when giving it.

Ive had another glance at the setup and found the following,

1. had a 2 inch apexi exhaust, which i have since removed to stock.
2. iridium IX bkr6eix-11
3. it has a denso sensor map, (will changing this fix the problem?)
4 the exhaust manifold is after market,
5. the fuel rail has been changed
6. the injectors are numbered nh25 on 3 and nh20 on one (are these stock?)
7, the throttle body has a brand of HAD.

this is wat i want, i want it to run normally with excellant fuel mileage, id really much rather get rid of all this stuff as opposed to keeping it on, but it may not be that easy to source all the stock parts.

i know the guy also had a computer and wasnt using the stock one but this has been removed,

what do you guys think is the easiest way to fix this problem, i mean can the stock ECU run all this diff injectors/manifold etc...

Help!