You need to do a compression test poss valve problem.its hard to say this could be a problem with the vacume advance on the distributor and or a carburetor problem too. Smell the oil, if it smells like gas there is too much fuel being dumped. and you need to park the truck, and change the oil and let the gas evaporate. Depending on what the problem is may take more expertise than you have. some carbs have a valve go bad that can cause this.but also it can be a timing issue.
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