Honda misses under load

Hi Guys,

I have an '80 Civic 1300 DX Manual 5-speed with under 50,000 miles. When
driving at a low speed and accelerating, the car starts missing and bucking
badly. I've checked mostly everything imaginable -- so many vacuum lines
and solenoids! Since the carburetor has been rebuilt and adjusted
(including the float levels), I suspected a leak in one of the vacuum lines.
But they seem OK. I checked the advance, both vacuum and mechanical and the
spark advances when speeding up the engine.

Any suggestions?

Thanks in advance,
Ed


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A clog carb. If this is actually your case you can see it. Here's how:

1. Remove the air filter assembly to get a good visual into the choke.
2. Hit the gas really hard. Do you see a big (1.5 sec of) good stream
of squirt inside the choke?
No- there's your problem
Yes- your problem is elsewhere.

Details: The carburetor has overcome with rust and debris from the
fuel tank. The rust and debris bypass the two filters somehow and
clogs the nozzle. The nozzle gives the car the extra push of
horsepower. The solutions are a rebuilt, replace both filters, and
possibly clean out the gas tank.
Koiji