This truck had a very hard time getting up ramps. When you accelerate it really struggles until you get on flat surface. Changed plugs, wires, rotor, cap. Drained the tar out of vaporizer. The screw to the carburetor was turned out, I adjusted that to where it idles a lot better, but struggles to accelerate. Any ideas? It is a 09 model and 3600 hrs.
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Yes this is exactly what it's doing. On flat surfaces it is ok, but on ramps it struggles. No I have not done a stall test, but we'll do. Thanks for the information.
is this slow acceleration ONLY on ramps (or with the truck in gear and brakes on) but seems to pick up to normal speed on flat surfaces? if so, you may have a bad torque converter. have you been able to do a stall test on the transmission?
How did it run before the tune up? Was it misfiring? Do you have vacuum advance...like pulling the hose off dist and it runs slower at 1500 rpm. Pull the carb off and check for carbon buildup in intake. It gets mighty thick and acts like a sponge, starving the truck then flooding it. If it has a cat con, it might be plugged.
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