If you have a coil pack (3 coils and no distributor), one of your coils may be bad. Especially if the two cylinders not getting spark come from the same coil. Each coil has 2 plug wires, serving 2 cylinders.
SOURCE: nissan ga15 engine idle adjustment locations
The idle speed is computer controled, it is not adjustable, you most likely have sludge in the throttle valve and the idle speed control air bypass valve, clean them with carb spray with the engine running.
SOURCE: 93 oldsmobile quad 4 2.3 one piston is not working wet spark plug
you probably broke a piston ring in the #4 piston have a compression check done
SOURCE: Car starts then immediately idles down and shuts off
i have had the same problem at times. my car would start and then shut off. but i found that i needed oil and check my oil and it was a quater low put in some oil and everything went fine i notices that everytime the oil is low the same thing happens also depending on the position of the car being park meaning that if you are in a down hill position or up hill position i will do the same. so you have to accelarate for 1 minute to have the oil go up. i hope this works
SOURCE: 2000 nissan xterra knock senor and plug 5
Have you changed all the plugs to platinum and wires? My xterra was doing that and I changed all of them and now it runs great. Also, I changed the distribitor cap and rotor button.
SOURCE: 2004 Nissan Altima 2.5S -
suggest try replacing the plugs with the old once.quite posssible faulty plug.
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