Thunderbolt IV ignition

blackbeard

New Member
Apr 2, 2010
43
Hampton,Va.
Boat Info
305 Sedan Bridge 1988
Engines
mercruiser twin 350s,straight drives
Is there a way to check the Ignition Amplifier.I cannot get my twin 350s to run past 8 knots. New plugs,wires,straight gas,knew props,did the same on old props,clean bottom.Please help
 

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