Yeah, you should lay off the caps, some people won't even respond if you are using caps. You describe some different things. An occasional stumble at a stop is normal air pump test, once per warm-up cycle. I am not sure exactly what you mean by kick. The most extreme symptom you list I think is when the gas pedal did not respond. Of course the first question is about the check engine light and codes.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra