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I've been dealing with something similar lately. Both problems you describe in fact DO seem related, and the common bind seems to be the ignition system.
Ignition problems are a pita to trace, but one of the common faults is that they tend to rear their heads in hot and humid weather, probably because such weather undermines an electrical field, causes shorts, and gets the parts (already really hot from flow) even hotter.
There are probably three possibilities. One is the crank sensor or wire, which on your vehicle is a MUCH cheaper replacement than earlier models (which more or less need a new distributor since its riveted in place). The second is the coil. The third is the ICU (ignition control unit) on the driver's side front fender by the battery (the parallel cable looking thing).
If you are an electrical dude check for continuity, etc. Some intermittent problems are a BITCH to trace since they rarely happen completely and never when you are equipped for a diagnosis. If you jst want to replace parts till the problem dissapears I would start with the RPM sensor and cable, then the coil, and finally the ICU though as long as the ICU is tight against the fender I wouldn't worry to much.
Of course I would FIRST check all the grounds, make sure the fuel pump runs well by jumping the sockets (see faq), and that the plugs and plug wires are new and clean and properly gapped.
good luck,
rt
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