I changed the spark plug , the wire set the rotor, the rotor cup, and the fuel filter ,my nissan pathfinder 1989. when i start the engine , it run erratically for a while and suddenly it stole, it has a strong odor from the exhaust .

hi shannon.
not sure if this link will be of any use but have a look.
1989 K3500 7 4l will not start Google Search

needs a tuneup, definately change fuel & air filters, replace spark plugs & wires, distributor cap / rotor, change oil & filter, it would'nt hurt to replace cat conv., it restricts exhaust flow, between you & me , take it off, put a straight pipe in its place, is your inspection up to date ? you'll have a year to replace your CAT, before next inspection. just remember that. nissans this year usually need to have the timing belt replaced, nissan charges $900 + to do it. BIG DIFFERANCE ! see how it runs after tuneup, also , you may end up replacing both the cam & crank sensors down the road. I would replace the OXYGEN sensor/s as part of tuneup, it will help a great deal.

letting a vehicle sit idle for months is not good !!! now you need to do some work, so get out your check book ! replace both air & fuel filters, replace spark plugs, plug wires, distributor cap & rotor, add fresh fuel & fuel injector cleaner to tank @ same time. why are you going from accessory to run, that doesn't make any sense, stop it, please ! now get to work, good luck !

Excess carbon build in your cylinders ,your engine is hot even if the gage in normal rings worn out no seal engine oil to the chamber ,change your fuel to high octane plus one injector cleaning fluid clean your air filter fit one set Iridium spark plugs set the timing give time 250 k for clean up your cylinders check your cooling system and flush fit new thermostat and radiator cup and antifreeze fluid.

have you tryed changeing out plug wires and spark plugs

the engine top to bottom + some wiring + computer + flush fuel tank and lines + replace fuel filter system

Hello! That is a significant change...I'll need a little clarification...Is the Check Engine Light (CEL) flashing?...Tell me how the engine is running...Do you see any smoke (blue or black) out of the exhaust?... Is the engine hard starting, idle poorly, hesitate or stall?...

If the CEL is flashing I'll send the procedure to identify the trouble code/codes that the Electronic Control Unit (ECU) has stored...

Guru.............Saailer

I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

vacum hose may be off some were

When last did you change the fuel filter ?

run the fault codes
indicates a problem crank/ cam position sensor