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ON THE UNDERSIDE OF THE INTAKE MANIFOLD THERE ISA PART THAT CONTROLS THE VOLUME OF AIR FLOWING THRU THE PCV SYSTEM. If is ruptured you will experience surging and many other problems related. To mixture. THIS MODEL HAS PROBLEMS with the electronic throttle control in the throttle body. Neither of these are easy fixes. If you remove thedipstick whith the engine idling and the engine begins to runrough it pcv related. If when you experience the surging you move the gear selector from D to 3 andte surging stops it is relatedto the throttle.
This is purely related to a primary fault in the fuel system but the ignition also needs to be checked.
So check the fuel filter remove carburetor and check the fuel chambers and ports for dirt and clogging. Check the fuel jets and see if these are clean.'
Now check the spark plugs, the gap and the spark intensity, if not check the HT coil, the HT wires.
Now the tuning requires the attention of an expert as when you tune the engine the condition will be evident. The fuel/air mixture and the ignition timing must allow the engine to idle with even motion.
On raising of the RPM the engine must come up in power easily.
I am sure if these two setting are in order the engine must work efficietly. However is the engine has clocked more miles, then the compression ratio , the valve settings must be checked.
Remove IAC (idle speed control) motor, clean with throttlebody spray cleaner & the port (hole)it came out of. Re-install & try it. If it cures it for a while & does it again, replace the IAC motor.
Per your description, I would suspect a fuel pump issue. When the fuel pump is running the pump impeller heats up. On an older pump the impeller can begin to seize up and momentarily stops and starts. Some times it just stops and has to cool down for a couple of minutes, then is ok for a while.
To test this theory, when the engine stalls and stops, your mechanic can use a rubber mallet and hit the bottom of the gas tank, this will free the pump impeller and the car will start again.
Or, have him install a fuel pressure gauge and go for a drive. If the pressure begins to fluctuate and drop, you know the pump is causing the issue.
Good luck, let me know.
Regards,
Here is the most common cause of surges and stalls, it is the idle speed control air-bypass valve and throttle valve, they get full of gunk over the miles and cause idle issues (stalls) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.
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