1984 Nissan Truck Out Blue Started Having Rough Idle Had Increase Idle Around

1984 NISSAN TRUCK
140,000 MILES
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ANONYMOUS
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Out of the blue, started having a rough idle. Had to increase the idle to around 1000 rpm's just to keep it running.
Found several vacuum hoses with cracked ends and replaced all one at a time. Removed the pcv valve and cleaned and tested, works fine. Used carb. cleaner to clean carb and it stopped idling rough for a few minutes and
then went back to rough.

Check distributor and plugs.

Any thoughts?
Oct 21, 2012 at 10:23 PM
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RASMATAZ
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Sounds like a Carb problem-replace the base gasket and see what happens-also is this a Z24 NAPZ engine
Oct 21, 2012 at 10:35 PM
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MR. TYLER
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Yes, Z24. Also checked the pcv valve yesterday and the egr valve. Both are good. This truck
does have a VVT (venturi vacuum transducer valve) which feeds the egr.

If I spray carb. cleaning into the VVT, it seems to run normal for a minute. Also, if I spray
carb. cleaner at the base of the carb. at the back of the unit the engine tries to die.
Oct 28, 2012 at 4:17 PM
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RASMATAZ
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Replace the base gasket than report back-try to die, when sprayed -it shouldn't do that if its not leaking-nothing will change-Let me know
Oct 30, 2012 at 12:50 AM
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