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Complete Mopar EFI/MPI system for a 4.0L six-cylinder is also the Mopar Performance platform to convert a 4.2L six-cylinder from carburetion to EFI. A variety of sensors help the engine save fuel and reduce emissions. Easy cold start, efficient warm-up, and fuel savings at normal operating temperature are some of the goals. A manifold absolute pressure (MAP) sensor knows the altitude, while the oxygen sensor(s) in the exhaust stream help keep the fuel mixture in check.