Chivas USA struck twice in second-half stoppage time to earn a point at FC Dallas.
The hosts broke the deadlock on 73 minutes when Jackson found the bottom left corner from 10 yards after being sent through on goal by David Ferreira.
Fabian Castillo doubled his side's lead seven minutes later following another superb through ball from Ferreira.
Laurent Courtois began the comeback with a precise left-footed shot as the clock ticked past 90.
Courtois then provided an assist for Juan Agudelo, who tied the game with a simple finish from six yards in the fourth minute of time added on.
Dallas are now without a win in four matches.
