read up
here it should be about the carb on your truck
ALSOa. Check carburetor for incorrect a n d /o r misadjusted
idle speed, float level, leaking needle and seat, air
valve, sticking choke or enrichment system and
secondary vacuum break operation. Adjust, repair
or replace as necessary.
b. Inspect carburetor fuel filter for presence of water
and/or impurities. Correct as necessary.
c. Check H.E.I. system as outlined in Section 6Y of
this manual.
d. Check, inspect and regap spark plugs. Replace as
necessary.
e. Check distributor spark advance mechanism for
proper operation. Repair or replace as necessary.
Inspect exhaust system for restrictions. Correct as
necessary.
f. Check carburetor mounting gasket for air leaks.
Repair as necessary.
g. Check and adjust valve lash.
h. Check for burned, warped or sticking valves. Repair
or replace as necessary.
i. Check engine for low compression. Repair as
necessary.
j. Check engine operating temperature. Correct as
necessary.
k. Check for loose, corroded or leaking wiring
connections (bulk-head connectors etc.) Repair as
necessary.
l. Check operation of exhaust gas recirculation
system. Repair or replace as necessary.
m. Check fuel system for leaks and/or obstructions.
Repair as necessary.
n. Check for vacuum leaks. Correct as necessary.
o. Check operation of EFE valve as outlined in
Section 6T of this manual. Repair or replace as
necessary
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