I changed my front seals and timing belt recently. It ran great for about ten minutes, then it started stuttering any time I touched the gas. It got worse and worse until it would do it all the time. I found out the timing gear jumped a tooth. I corrected that but it didn't help. After sitting for two weeks, it still does it but not all the time. I thought I bent my valves but it would run bad all the time if I did. Any ideas?