Toyota Tacoma Brake Warning Light

I Have A 1998 Toyota Tacoma With 274,000 Miles, The Brakes Are In Good Condition At 70%, The Fluid Is Full, The Brake Light Comes On And Off...

When Cold The Engine Runs Rough And Misfires And The Brake Light Is Lit. The Roughness Does Not Occure If Under Load. When Warm The Brake...

I Need To Replace My Brake Light Switch On A 1989 Toyota P/u 5 Speed. I Cannot Figure Out How To Access It, And Don't Want To Remove Entire...