2001 tahoe hard steering to the right 4wd

[lennit]

Hello everyone i have a 2001 tahoe that steers normal to the left but when turning to the right at low speeds it feels like it looses some of its power steering assist.. now if you can rev up engine a bit it seems to be OK.. I have flushed system, installed synethic fluid..it does have variable assist steering.. any ideas or anyone had this problem

THANKS

[andjh123]

EVO module/sensor perhaps

[jrbueiz]

What's the correct name for the EVO? What's the part number? Does anyone other than the dealer carry it?

1999 Tahoe