i got a b series motor in my ek and i just bought a harness and got all the check engine lights off but it still surges from around 1200 rpms to about 1600 i mean the car runs great but i just cant figure this one out anyone have any input thanks in advance.

 

check the idle air contral valve on the intake manifold,it may need
an adjustment,if you need help pm me....

 

clean what the idle air control valve

 

thanks guys i appreciate it ill let you know how it goes

 

TEC top engine cleaner and Brake parts cleaner. crank the car up take the intake off hold the TB open half way and spray the TEC in the IAC port and into the TB do it till the cans gone. No need to rip anything apart.