Haha. Yeah a lot of the newer vehicles have octane probes and will advance/retard the timing accordingly to get the best power. Our older trucks do not, so unless you adjust the timing manually with a programmer, the power was all in your butt.
Rhino, I agree with the consensus- you've got a clogged vent. You can top it off if you manually hold the gas lever slightly open and let it drizzle down in there.