Narrative:

After being cleared for takeoff; my copilot (the pilot flying); brought the throttles slowly up to takeoff power. At full throttle; the left engine surged to 42 inches manifold pressure; then dropped to 37; causing the plane to yaw; and directional control difficult to maintain. I took controls and made the decision to abort the takeoff; bringing the throttles to idle; slowing down and taxiing off the runway uneventfully.

Google
 

Original NASA ASRS Text

Title: Cessna 402C Captain reported rejecting the takeoff after the left engine experienced a power surge.

Narrative: After being cleared for takeoff; my copilot (the Pilot Flying); brought the throttles slowly up to takeoff power. At full throttle; the left engine surged to 42 inches manifold pressure; then dropped to 37; causing the plane to yaw; and directional control difficult to maintain. I took controls and made the decision to abort the takeoff; bringing the throttles to idle; slowing down and taxiing off the runway uneventfully.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.