my car dies !

[natguerrero]

im new to this and iv only posted a couple of things but this is a little more technical so i do know where to start looking for this problem.....

i just brought a 240sx with a sr20det red topand i haven't drove it much do to water pump that needs to be replaced.but when i start it i have to keep the rpm's over 1000then when i let off the pedal the car diesbut if the rpms hit 500 i can give it more gas and it will idle right again but when i let off the car will die ! so where can i look and what can i do ????

[CotBU]

check ecu for codes.check tps voltage, key on engine off. adjust via fsmraise idle via iacv if adjusting tps doesn't fix it.then check timing, set 15deg

[Divine0425]

Might be you fuel pump