engine

What is your question?

i have a 1993 4-runner/toyota.i was driving it and it went from running 55 miles per hour down to about 5 miles per hour.don,t run hot,at lease not while it sitting and running,idles perfect.when you drive it,it has no power what so ever.one guy told me it was some type of senser,is this true.or do you have some other explanation.