slight idle issue

[peste noire]

hey whats guys, i been looking around at other post but couldnt really find what i was looking for.

i have 640's( was told they were 550's unitl i got them cleaned and flow tested and found out they were 640's) walbro fuel pump,lex afm,afpr,60-1 turbo, safc and so on

my idle was fine until i put the "550's". it just jump while im at the light or something. it goes from 500 800, sometimes.

my afrs are pretty lean at idle, 17.0-18.0, at wot its 10.4-11.5 and at cruise its around 13.5

i havent tune my car yet if that is an issue.

thanks for the ahead for the help.

 

[IndigoMKII]

Replace your 640's with 550's and problem solved. The reason you do lex afm and 550's is bigger they're 25% bigger than the stock part.

 

[hvyman]

Just use the afc and pull and add fuel where needed.