154 engine sputtering, surging

[A/C guy]

Tune up this spring, everything working great. Now it's starting to sputter at random times like it's running out of fuel. Only lasts for a second or two. I've cleaned the sediment bowl and screen twice. Didn't help. Should I dive into the carb, and what should I look for?

 

[staninlowerAL]

Quick checks (if you have an IH carb) is the fuel inlet screen in the carb if it still has one. Also the main jet might need cleaning. Usually a flush with carb cleaner and blow it out with compressed air is sufficient. If the problem persists maybe look for a random misfire in the wiring/dist cap/plug connections, etc. When you done the tuneup did you adjust the valve clearance? JMHO Stan

 

[tst]

also check the timing, make sure the advance works also

 

[Don McCombs]

I’d start at the outlet in the fuel tank. Look for debris covering/blocking the hole.

 

[SONNY]

carb jet getting hairs in it. only takes 1 to slow down the flow. rust from line can get in the carb and unless filter is directly on the carb the rust can get in. Use a neo line so you dont get rust from them ancient steel lines!