Car Jerks at highway speeds

beyerc
Mon, 25 May 2009 03:13:39 +0000
Maintenance/Repairs

I have a 1993 Ford Ranger 3.0L V6, Automatic Transmission. The truck has 217,000 miles on it. Recently I have noticed that at high speeds, normally around 50-60 MPH, the car jerks violently as if it is misfiring. Also, while this is happening, the tachometer jumps in a range of around 500 RPMs. This only happens as described at high speeds or while under heavy load (up a giant hill, trying to pass someone). When driving around the city, it runs pretty well, except for a little rough at idle. I have also noticed that even at idle the tachometer bounces a bit, but not nearly as pronounced as it does at high speeds. I have already change the fuel filter and had only small improvements, if any. I get a check engine light from time to time, but it disappears after a few minutes, only to return again a while later. What could be the problem?

11 posts - 9 participants