yo BB,
WELCOME BACK & WELCOME HERE!!
Take a look at this info
Hesitation, deadspot or stalling that only seems to occur after the first mile of warmup.
1) Defective electric assist on choke 1) Replace it.
2) Defective accelerator pump (low output). 2) Replace it.
3) Float level setting very low. 3) Adjust to factory specs.
4) Bad ignition condenser. 4) Replace it.
5) Plugged heat crossever system in manifold. 5) Inspect and clean passages in the intake manifold and heads. Test heat riser valve, replace if defective.
6) Defective source of hot air up to the carburetor. 6) Check and replace as necessary: heat shroud duct, temperature sensor, vacuum door moter, manifold vacuum supply.
7) Defective thermal switch. 7) Check all thermal switches, especially those connected with the distributor, EGR, & vacuum motors in the air cleaner housing.
by Recarbco Fuel Systems
http://www.recarbco.com/technical/newtrouble.html#Hesitation
See my Vacuum Leak Test at
http://broncozone.com/topic/22770-low-idle/
On an idling engine check for vacuum leaks using a mechanic's stethoscope with the probe removed, or a ~3' garden hose section. BEWARE of fab, belts, pulleys and hot engine/hoses.
On COLD ENGINE only, use propane torch w/rubber hose attached, UNLIT (have fire ext @ hand for all tests)
or spray carb cleaner, when it gets to the the leak the RPMs will rise.
Also check: vacuum hoses; intake manifold gasket & throttle body;
GL!
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