My 91 4 runner, with 192k miles, has very scarily lost power twice on the highway. She gets to about 50mph and then drops to 40, 30, 20 rapidly. First time I had her towed because I didn’t want to take the chance I couldn’t arrive safely at mechanic. 2nd time, I just sat for awhile with her running, and tried and succeeded to get her to mechanic. First time, mechanic thought there was some boot loose around the fuel line.Second time, mechanic is stumped.
She has new fuel & air filter (and battery + leads); catalytic converter tested fine. Had a tuneup less than 5k miles ago.While I feel safe driving around town, I am terrified of highway driving and need help getting her fixed so I can resume highway driving.