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I have a 1990 Mercury Sable, 3.0 engine, 40K orig. miles. I bought it a year ago, was running fine. Starting having trouble in the morning starting, had to keep my foot on the gas to keep it running. Then it started to backfire, sputter and lose power over time. Had a diagnostic run, not throwing codes, was told the fuel pump, replaced the fuel filter and pump. Not the problem. The plugs are good, rotor good, have spark, injectors fine. Pressure was fine thru the rails, regulator was fine. Now it wont start at all. Any suggestions?