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I just got an 83 zx over the summer, ran great the whole time. Now after engine comes up to operating temp when driving, it misses at 3,500rpm on hard acceleration or not. It won't rev past that. Engine doesn't miss and will rev past 3500 normally during the first 5 minutes of driving it.

Replaced fuel filter, checked fuel pressure 35psi, normal. Replaced plugs, cap, rotor and wires. Maybe the Distributer?. Has some shaft play. Just found out tonite the vacuum advance doesn't work. Would no vacuum advance cause a miss during hard or steady acceleration?.

Any Suggestions.

Dexter 260z
 
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