I have a 93 f150 302 2wd 165k miles. When I put a load in our go up a hill at part throttle I get a bad vibration or shutter. I thought that it might be a miss but I dont notice it at idle. As far as I know the egr and cat. converter have never been changed as well as the o2 sensor. My gas milage isn't the greatest either. Some people have said tht it might be a combination, I hope to find it quick and fairly inexpensively. Thanks for your help. deankpad

 

See if you have any codes.
http://fordfuelinjection.com/index.htm

 

I tried once and the guy from AutoZone didn't seem like he was on the ball.
he wasn't sure if the truck had a two code system or a three code so he gave me several possibilities.

 

The OBD-I system test plug is under the hood just behind the air filter box.
The OBD-II is under the dash. I've read where some trucks in your year range have both, but only one works. Ford, go figure. I think that was the change over year. Also, if you read the link I put, it will tell you how to pull the codes without a reader on the OBD-I. You'll need the scanner for the II.

 

I had a similiar problem. After pulling codes I found it was related to the EGR system. Check out the link from LoosMaster. That is where I learned what I needed to know about pulling codes and testing the components. If the problem is related to EGR, test the EGR valve, the EGR position sensor, and the EGR vacuum regulator. My problem was the vacuum regulator.

You have to know where to start looking for the problems, and pulling codes is the best way. Then test the components. You can go ahead and start replacing things, but if they aren't broke, why pay to fix them?

Think about replacing the O2 sensor. This might not solve the problem, but it is good maintenace to replace them every 30k to 50k miles.