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Well if you have a carberator on this truck it is most likely the booster pump
try hooking up the hose to he jetski
Try setting the timing a little higher to get rid of the bog.
Try to accelerate slowly when leaving the stop light.
You might try checking you idle air control valve.
could be a vacuum leak and clean your throttle body out.
Accelerate - gravity will always try to pull the car downhill.
Try to accelerate slowly when leaving the stop light.
Is it bogging down? if thats what your referring to, then maybe try a fuel pump if yoir car has one.
newer cars could be air filter or fuel filter. older cars could also have improper timing on the plugs.
When was the last the blade was sharpened? You may want to try sharpening if it has been a few years.
The angle in which you are cutting is probably where the carburetor is on the downhill side. The oil in the sump tends to seek its on level in the same direction. Try mowng in the opposite direction where the carburetor is on the uphill side.