Check motor mounts
You could have a slipping clutch which is not transmitting the drive correctly.
some black smoke is normal, however, if you think yours is smoking more than normal, have the timing of your injection pump checked, you could be dumping too much fuel.... The heavier you accelerate the more smoke you'll make regardless of injection pump settings so get the injectors right and lay off the pedal.
No - have you checked that it is firing on all cylinders - Sounds like the engine is mis firing or not firing on all cylinders.
Glaciers move slowly.
yes
could be misfires or possible torque converter shudder in lock up. best to visit your gmc dealer
Try to accelerate slowly when leaving the stop light.
Braking
Whichever is lighter will accelerate more quickly.
Try to accelerate slowly when leaving the stop light.
My truck flutter and temperture gauge drop at the same time
your accelerator is finished (broken)* basically you don't have an accelerate, just two brakes :3
Well if you have a carberator on this truck it is most likely the booster pump
Accelerate slowly with the vehicle in a higher gear
COULD BE A NUMBER OF THINGS...YOUR POWER STEERING PUMP MAY BE BAD.
Your acellerator pump is allowing the carburetor to almost flood.you need to replace the accellerator pump piston.
slowly