This question came from my Mom's boyfriend:

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[/align] Sat. I shifted out of low at 4000 then the engine started popping through the carb. It does that while under load, but cruising up the street at 25-30 mph in high, it was smooth. any ideas?
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I think the car (67 cougar) is starving for gas (secondaries). What do you all think?
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Spark plug firing while intake valve is still open.

Worn out valve springs that can't close fast enough anymore - maybe
Worn out valve that doesn't seat all the way - maybe
Too far advance timing causing the plug to fire before the valve is closed - common
Poorly adjusted/loose rocker arm - my bet

 

It wouldn't be firing if it was starving for gas. Sounds like he needs a valve job.

 

"What's a ZJ? If you have to ask you can't afford one"

ahh sh*t I thought valve job was zj instead of vj. you old farts wouldn't figure out the quote anyways. [8D]