Stall and buck
 

I have a 1995 F250, 460 4x4 super cab 5-speed w/80,000 miles. On the same day it began stalling when starting out, the speedo needle bounced like crazy, and it bucked at high speed (70mph) and when going up hill.

I changed the speed sensor with no results, replaced the fuel filter, plugs and distributor cap. It still stalls in 1st gear, bucks at high speed or when going uphill, and the speedo needle still jumps. Any similar experiences and solutions? Thank you.