What's that popping sound?

I have a 1968 Ford f100 pickup. The truck has been sitting their for a few years. I have recently began to work with it and every time I turn it on, the engine makes a popping sound. What is it?

Hi, it might and most likely has some stuck or sticking lifters and maybe bad fuel. Is the popping coming out the intake or exhaust? I have freed up some by running one qt. Of ATF in the oil it should un stick the stuckie ones. Could also be a bad timing chain at that age. New plugs and or wires. If you start it at night you can see if the wires are bad because they well short thru the make lightning under the hood.
good luck
tim
PS I own several old cars 2 1960's and 2 1970's

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