I Have A 99 Toyota Tacoma And The Check Engine Light Came On. I Did A Dio On It And It Comes Up Egr Problem. I Took The Valve And All Hoses Off And Cleaned Them , Cleared The Code And 2 Days Later The Light Is Back On So Then I Replaced The Egr Valve Cleared The Code And Sure Enough 2 Days Later The Light Is On Again. What Else Can I Try? Any Ideas?