One of the best ways to develop a stronger sense of rhythm and timing is by practicing basic clapping exercises with the metronome. All you need is the free metronome at metronomeonline.com (no instrument required) and the will to improve yourself as a musician.
I see a lot of musicians out there who are great at making good sounds and are funky and awesome sounding but their sense of rhythm is totally ungrounded. They speed up, they slow down and its almost beyond their control. I used to be like that but after years of practicing with the metronome very diligently I’ve finally come to a point where I can hold a rhythm, take the role of a drummer and ease into consistent repetition. This is what really makes music have a sense of grounding.