Initially after the spark plug replacement the car ran okay for a week or so. Then the car began to be a little hesitant at acceleration so I replaced the Throttle body. The car improved from that state then a few days after that severe rough idle and surging. Now difficult to start....
SOURCE: 2005 Jeep wrangler w/rough idle and hesitates when you accelerate
try fuel injectors....run a bottle or two with full tank through it and see if that dont solve the problemo.....
SOURCE: under 2000 rpms runs bad/hesitates/check engine light
This IAC valve runs only when your foot is off the gas pedal. Mainly to keep the engine from stalling and keeping it at a safe RPM. If it is running bad under 2000RPM, more than likely its the IAC valve or a vacuum leak. Clean or replace the IAC valve....Hopefully this helps!!
SOURCE: '91 miata 60M miles -
change the mass air flow meter ,the one in the pipe from the air filter to the inlet manifold
SOURCE: Replaced plugs and coil pack on 2001 ford taurus now car will not start
You will need to figure out if you have spark to the plugs, and if not- if you have voltage to the coil to proceed.
you either have a plugged fuel filter, a plugged converter or a bad mass air flow sensor
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