I just had the same problem with my daughter's '94 Grand Marquis last week. It
bogged very bad until warm. She also complained of pinging when warm. I cleaned
the Mass Air Flow sensor and all was well. If the hot wire in the sensor gets
contaminated, it is basically slightly insulated from the air flow and the
sensor reads lower than actual air flow allowing the computer to lean out the
injectors. 5 minute job.
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