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Update:
The nissan dealer tells me that I need NGK-5 plugs on the exhaust side and NGK-6 plugs on the intake. I replaced all 8 plugs (again) per these OEM specs.
I also replaced the thermostat, that fixed the no heat problem.
Still have the problem of cutting out/sputtering. Unfortanately, the spark plugs did not fix the problem. I have also inspected the distributer cap and rotor, and don't see any problem. I don't know what is causing the misfire at this point. It could be a vacuum leak, but I suspect it is a spark problem.
I got my Chilton's manual, but I really don't know what to try next.
I talked to a local nissan specialist who said the canister rusts on every z24 he has seen, he didn't think that was enough to cause a misfire. Actually, the canister had been "bypassed" on the '87 truck he was working on while I was talking to him. He says it just recirculates exhaust. Besides, it has been rusted since I bought it 2 years ago, and I never had a prob before.
Anybody got anymore suggestions? Thanks.
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