well, that could be it...you might be losing spark up top in the revs. it's easy enough to check gap. get a gap tool at an autoparts store. piece of cake. just be careful not to f up the electrode when you do it. oh, and how are your plug wires/cap/rotor?? fuel filter? air filter?
by the way, skip jacobs. i had one on an old jetta. it did basically nothing. your OEM ignition should be fine for now (unless you have a T88 and 30 psi and you just haven't told us yet <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/wink.gif" border="0" valign="absmiddle" alt='
'>). i'd say just freshen everything up and check plug gap and see how that does for ya.
Eric