1998 Lincoln Navigator- Check engine light flashes but only when accelerating @ over 50mph & usually only going uphill & feels like the engine is slipping. While on regular streets, the theft light slightly lights up and when it does it feels like the engine is slipping. Can anyone help?
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Check the fuses. Usually the data link connector is powered of an
accessory fuse or the cigar fuse. If the fuse is blown than there will
be no communication with the computer. Once the fuses are checked and
any blown ones are replaced bring it back to have it scanned.
have someone check the igniton system,which consist of plugs,coils,and injectors.that truck usually have bad coils that go out. make sure it didnt start after you have gotten gas. it may be bad gas if so.
Most likely the throttle position sensor is bad. If it is idling weird and misfiring and barely running while accelerating, then the coil packs may be bad and you should check each cylinder for spark. Let me know if you have any more questions. Do check for vacuum leaks as well. Is your check engine light on? If so, you should have your engine codes read to pinpoint exact problem