lack of advance will normally cause the engine to bog on acceleration

i believe these dist have some mechanical advance plus vacuum advance
a stuck dist plate will limit the mechanical advance too

check your specs ~~~ initial setting and full advance
then put a timing light on it, check the timing at idle and rev it to see what the full advance is, which normally full in at 3000 rpms

does sound like your vacuum advance is bad



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1989 300ce smoke silver / brazil, in a constant state of flux ~~~