Chips for toyota's dont work like that.
What you need it a tuner, in import cars, you cant just replace the chip, you need to work with the stock computer.
www.URDUSA.com makes products for the 4.7l v8.


89 4Runner
3" BL, M/T locks, 33"bfg mt, bilstein, Kayline, tubebumper, toyotafiberglass panels
TBI: Elocker,3.4 w/ORS,b+b,S2Sstg2cams,arias pistons,P+P intake,TRDs/c,URDpullies+7th,downey headers,MAPECU2,WEGO WB, SupraMAF,walboro255,stg4clutch, EPaOo2 sim