had the same problem a couple of years ago when my dad owned the car.
did the plugs, wires, upgraded the opti while we were in there and did the lt4 knock sensor and module. the prob went away...cant specifically say which part did it for me but sounds like ur on the right path
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1994 Z28...SOLD
1994 Honda Civic LX 1.5L.....not to be riced
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