Here is my problem my car has been idling funny and some times stalls. I get like a bluish blackish kind of smoke when im idling only when im idling and it does it off and on. I was driving on the high way when my car started to bog i let of the gas pedal and pushed it in again it went away then it would do it again so i just keep doing that till i got home. Now im pretty sure that this is my fuel pump so im going to replace it. I want to know what kind do i need if i could just put the stock one in or if i need a 190lph walbro or 255lph walbro. thanks

Here is my setup
1990 crx dx
jdm d15b
14b at 8lbs
hf mani
440cc injectors
vafc 2
po8 ecu
dpfi to mpfi obd 1 of course