i have an 86 pontiac grand am, it just started this pulsating while driving it,...

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b-rich

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...it only does it after warmup? complete warmup, the exaust smells horrible, and it misses, think it is electrical or fuel? i changed plugs in it about 2 months ago, wires are a pain in the butt to change.. but i can do it, changed o2 sensor also about a month ago,its not puffing any black smoke so i dont think its running rich,n fuel seems to be spending normally, what can it be?
the exhaust smells like sulphur, the cat helps the o2 sensor? even though the o2 sensor is up in the manifold? rem this is old so gm just ran a 1 wire sensor up there and thats it
disconect the converter? thats gonna be loud as crap then, pretty much running right off the header....
 
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