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Half throttle power lose
1997 200 mariner magnum efi runs and idles fine just at half throttle it's like a dead spot.runs great at full throttle
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Mercury 3L/4 Stroke/Verado Moderator
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Good idea to check the BASICS (Compression, Spark, Fuel Quality, Delivery and Pressure), perform a sweep-test of the TPI, and if no problems are found- check the Trigger (resistance tests, while slowly advancing throttle from idle to WOT position and back). Sometimes a "break" develops in the trigger harness that presents in only one position of the throttle.