S14 swap running like Sh** Any help??

[9240sx]

S14 sr20 in a s14...Car idles pretty bad and is only pulling 5hg of vacuum at the bumpy idle it has at 800-900..Its boosting fine to 8 psi...But after about 4500rpm it starts bucking very bad...And another thing the plugs are BLACK after a few mins of running the car...Car smoking pretty bad to..We cant find any vacuum leaks or boost leaks...Thanks,

[IanS]

Tell us a little more about your setup, tuning, and bolt ons, also check the following.

check fuel pressurecheck mafs voltagecheck tps voltagewhat spark plugs are you running

[9240sx]

It not my car.Im helping a friends friend out..I guess he did the swap...Looks all stock to me...Intake,open downpipe,FMIC....I put in some Sentra ser plugs Bk6 something....

[IanS]

did you gap them, the stock gap on those plugs is way too wide, you need to gap them down to between .028 to .030

check fuel pressure and MAFs voltage, also check for ECU codes

[9240sx]

Yeah gapped them to 0.30...Ill check for TPS and MAF voltage..Whats the correct ECU for a s14 engine?? Is it WC