Hello guys
So I have a 1988 Toyota pickup 4wd manual transmission with the 22re engine, I use it some times to go from North Carolina to Atlanta a 6 hours trip, everything was working fine but las night I was coming back to North Carolina and I started feeling the truck jerking when reaching 70 and over miles per hour, just for a second it feels like I was hitting a invisible pot hole, if going up a hill at 65 to 70 mph and acelerate to maintain speed truck jerks sometimes or I feel like a little wobble or shaking.
I stopped midway to fill gas tank and truck seems to be idling just fine.
I haven't done any tests since happened last night and I would like to know what should I test first.
I changed sparks plugs, wires, distributor cap and rotor, fuel filter, air filter about 7000 mile ago when I bought it.
Also have done oil change.
Could it be fuel pump failing?
Ignition coil maybe?
Thanks in advance for any info.

 

fuel filter?