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is the check engine light on??
2 common issues.
mass air flow sensor, connector or the hose going from it to the throttle body
vacuum leak on the pcv hose from the top or valve cover to the throttle body
ok, I would start by checking the connector on the mass air flow sensor. then check the line for the pcv from the throttle body to the valve. it is common for the 90 elbow to rot out and leak vacuum giving you these symptoms
you cannot clean the sensor. there is no cleaner that can get the burned carbon off the hot wire. it will remove loose dirt but not the burned on carbon.
what else have you done??
did you check the pcv line??
do you have a scan tool??
ok, I attached a picture for you to be sure we are talking about the same thing. look for the hose being collapsed or squishy.
there are 2 different 2.0 dohc. I checked both and they are the same. I believe you because sometimes these manuals are not accurate
did you check the elbow to be sure it was not collapsed??
dod you have a scan tool??
while I am looking for the new info, get the long term trims for me from the data screen
yep, check them all as well as the other ends. especially at the valve cover. very common failure
no, shorts mean nothing at this point it would be from the valve cover to the throttle body in the back
possible failures for the long term up like that are
pcv valve itself failing
mass air flow sensor or hose
low fuel pressure. you can have fuel pressure but not enough. the pcm will keep calling for more fuel but cannot get it due to low pressure.
what vacuum test???
the only test I would do for that is use a smoke machine to inspect for leaks.
ok, I never use used parts. does the voltage change on the mass air flow when revving the engine up and down??
the fuel pressure is more important
thats engine vacuum, not external leaking. that is done with a smoke machine. you pressurize the lines and look for leaks
ok, thats good.
take some carb cleaner and spray around the intake manifold and see if the long term trims change. that is also a common area for a vacuum leak