Ford Escort transmission bucks during driving and won't downshift, possible vacuum leak issue on Ford Escort

Some Ford Escort owners report experiencing transmission issues, such as bucking during driving and a failure to downshift, potentially caused by vacuum leaks. Symptoms of these leaks can include rough idling, stalling during takeoff, and overall poor engine performance. Many owners find that cracked or broken vacuum hoses are common culprits, which are relatively inexpensive to repair. However, more serious issues, like a cracked intake manifold, can lead to vacuum leaks and may necessitate costlier repairs. It is crucial for owners to address vacuum leaks promptly, as they can significantly impact engine performance and fuel efficiency. While a small vacuum leak may not pose an immediate danger to the engine, it is advisable to resolve the issue to prevent further complications.