Check the pcv well ,some times small hall can cuse this problem,
You should check the vacume inside the Rubber band in the tube that feed the inj also .
See this tube .
Hope u finde the selution
https://youtu.be/qVj8INH8NtY
Testimonial: "I appreciate it. I just got a new PC valve and hose going to try that. The car has 230768 original miles on the PC valve"
SOURCE: 97 jeep wrangler 2.5 running lean
check fuel pressure and check exhaust for leaks. exhaust leaks caqn play with the o2 sensor readings
SOURCE: 91 LEGACY STARTED RUNNING ROUGH
The cylinders are numbered as on the spark pack you changed. You might have done better putting the seafoam in the tank as an injector cleaner. Not sure why you changed so many parts, you seem to know how to get the codes from test connector lead hookup and the blink pattern. You might also want to check the fuel rail pressure and the crank and cam angle sensors. Before replacing the injector, swap the #4 injector with the adjacent one and see it the code moves with the injector or stays put. If the code stays on #4, then check the injector wiring, if it moves clean or replace the injector.
SOURCE: 1996 Chev Cavalier chugging and stalling running rough idle
Bad injectors causing the vehicle to run poorly can cause other damages to sensors etc. Buy a code reader and check the codes.
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