The inside of the spark plug boot/cap likes to break and not hold tight on the spark plug. I carry a spare OEM spark plug cap in the trunk. Mostly happens to modded 50's but its happened on my stock Zuma also. The other thing thats popping in my head, but never saw it on a Zuma yet, is vapor lock. My 64 Impala loved doing it! Last thing I can think of. Is something wrong with the transmission? My 98 Zuma had a damaged torque driver and would just choke out the motor when it got up to speed. Luckily I had a spare torque driver. We have the luxury of swapping out parts between Zuma's if needed. I have horrible trouble shooting skills that come from working in a factory. Its cheaper and faster to just swap out a part then it is to diagnose the problem. Will list anything else I can think of later. You keep us posted to.
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