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electrical problem on 1991 Cadillac Seville

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backfirin promblem change d computer bcm module and the ecm module, new coil pack distributor,sparks plugs and wires new starter and alternator can it be d relay
(2) Answers
It is not uncommon the have fuel injectors fail on the 4.9L engine used in your 1991 Cadillac Seville. However, after all the work you have done to try and correct this issue I would recommend that you have your problem diagnosed by a qualified technician before attempting any more repairs.