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What type of efi fuel injection unit does a 1988 mercury grand marquis ls with 5.0 have either gt-40 explorer and theres another that you do not know the name of?

The 1988 Mercury Grand Marquis LS with a 5.0L engine uses a Sequential Electronic Fuel Injection (SEFI) system. While there might be slight variations in components depending on the specific build, the core system is SEFI. The terms "GT-40" and the other unknown name you mention likely refer to specific intake manifold designs, *not* the type of fuel injection. The GT-40 intake manifold was a popular upgrade but wasn't the factory standard on the '88 Grand Marquis. The fuel injection itself remained SEFI regardless of the intake.
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