Angry Coventry promoter Mick Horton apologised to Bees fans after his team was held to a 45-45 draw by Belle Vue.
Coventry appeared to be cruising to Elite League victory when they led 30-18 after eight races at Brandon, but things quickly went wrong for the home side.
The Aces closed within four points in time for the final race and their top-scorers Matej Zagar (13+1) and Kevin Wolbert (12+1) combined for a 5-1 that levelled the scores.
The result left Horton seething and he promised to make changes to his line-up if there is no improvement in their upcoming performances.
He said: "It's not good enough. I am so unhappy and I can only apologise to the fans because being twelve points up we should have finished the job off.
"Fair play to Belle Vue, but that was a very poor performance.
"We can't make excuses, the boys have got to step up to the plate starting on Monday at Belle Vue, and if I don't see an improvement next week I will make some changes."