85 toyota pickup 22r. After interstate driving for 20 (ish) miles it will begin to lose power and struggle around 60, will buck (like it's out of gas) at 63. Idles fine. Sight glass a little over 1/2 full. After shutting it off for just a moment it quits and doesn't act up again for quite a while until today, when it acted up about 10 miles after resting

 

Check the filter by the gas tank, or just replace it. Maybe run some Berrymans B12 thru the tank. Check old vaccum lines, replaced mine with silicon ones years ago.

 

Sounds like the jet may be clogging up as you drive. In addition to the filter, which is really a small, cheapie, back on the frame, passenger side. right near the rear tire. Make certain to clamp off the line coming from the tank, especially if the tank is anywhere above near empty. Otherwise, you'll get a face full of gas. Not fun. Make sure you wear safety glasses!
In addition to that, you might want to pull the carb's top half off, and clean the bowl, and the jets. A quick shot of carb cleaner works wonders. Make sure to clean the fuel passages, too. You may well need a new gasket for the two halves of the carb when you go to put it back together. There are rebuild kits, readily available, that include all the gaskets you might need. Some also include new jets, and so on, but the jets are super easy to clean. Just make sure that if you remove the jets, you don't damage them in any way, if you're going to put them back in.
Clean the valve that feeds the bowl, too. If it's getting partly clogged with debris, it might not be allowing the fuel to flow as fast as you need at freeway speeds. Ok at idle, but at high speed, not so ok.

Make sure that when you put it back together, you get all the little arms and such on the side back together correctly. The FSM has a pretty good write up on How-to.

Have fun!
Pat☺

 

Thanks. I changed the filter already, drained tank with a hose because I originally thought it was bad gas. Guess I'll be pulling the carb next

 

No need to pull the carb, unless you want to do a rebuild of it. Only really need to pull it in half, so to speak. Once the top half is off, most of the stuff that needs cleaning is pretty accessible. Like the jets, the bowl, most of the passages and so forth.

Not saying to NOT pull the carb, just that you don't really HAVE to. If you want to take it into your kitchen, and spread it out all over the table, which generally tends to annoy wives who want to serve dinner, go right ahead. Just remember the old saying, happy wife, happy life

Have fun, whatever you choose to do
Pat☺