My folks have a 928s '86-'87 porsche that just seems to die on them when getting to about 40+mph? once you sit for a minute, it will start back up. we've wondered if it may need a fuel filter? any thoughts on this situation...
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Sounds like a fuel supply problem. Does it pop through the carberator as it it is dying, like a lean back fire? If you drove it up a hill would it die before 35 or 40 mph? If the fuel demand excedes the fuel supply the engine will die, but would restart after cranking the engine for awhile. Possibly a plugged fuel filter, fuel line, rotten fuel hose, ( sucking air ) or tired fuel pump. Hope this helps.