TM   10-3930-638-24&P 3-4. FUEL SYSTEM TROUBLESHOOTING (cont) MALFUNCTION TEST OR INSPECTION CORRECTIVE   ACTION 6.  ENGINE  IDLES  IMPERFECTLY  (cont) Step 4.  (cont) a. If linkage is binding or burred, replace (para 4-3b); if foreign matter is present, remove; if metering valve is sticking, replace (para 4-3b). b. If linkage and metering valve check okay, proceed to step 5. Step 5.  Check that metering valve spring shim is installed (para 4-3b; notify general support maintenance). a. If metering valve spring shim is not installed, install (para 4-3b). b. If metering valve spring shim is installed, proceed to step 6. Step 6.  Remove and inspect idle spring (para 4-3b; notify general support maintenance). a. If idle spring is broken or permanently set, replace (para 4-3b). b. If idle spring is okay, proceed to step 7. Step 7.  Check governor linkage hook for proper adjustment  (para 4-3b; notify general support maintenance). a. If governor hook is not properly adjusted, adjust (para 4-3b). b. If governor hook is properly adjusted, proceed to step 8. Step 8.  Disassemble automatic advance components and inspect (para 4-3b; notify general support maintenance). a. If automatic advance components are worn or damaged, replace and adjust (para 4-3b). b. If automatic advance components are okay, proceed to step 9. Step 9.  Remove fuel injection pump regulating piston and sleeve and inspect for burrs, corrosion, and varnish accumulation (para 4-3b; notify general support maintenance). a. If piston and sleeve are burred, corroded, or varnish accumulation is present, replace (para 4-3b). b. If piston and sleeve  check okay, proceed to step 10. Step  10.    Remove  governor  spring  and  inspect  (para  4-3b;  notify  general  support  maintenance). a. If governor spring is broken or permanently set, replace (para 4-3b). b. If governor spring checks okay, proceed to step 11. Step 11. Inspect governor linkage for breaks or cracks (para 4-3b; notify general support maintenance). a. If governor linkage is broken or cracked, replace and adjust para 4-3b). b. If governor linkage checks okay, proceed to step 12. 3-14