Do you here rumbling also from one or both sides front or rear if its four wheel disc brakes one or more brake calipers can be locked up or the emergency brake is not releasing in the rear if drum brakes in the rear the return springs could have broken this is what pulls the brake shoes back when you take your foot off the pedal and will make a lot of noise and cause resistance because the brake for that wheel is partially or fully applied LATER MAN!
SOURCE: 1986 chevrolet silverado truck engine hesitates when accelarating
Along with the vacuume leaks I would check the carb. The accelerator pump might be out of adjustment or something else in the carb. Currently I have the same problem with mine and I just adjusted it and for 1 day so far it's ran fine but I have a holley on mine. Carb may be dirty also.
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