ok here is my problem. iv'e got the 3500 rpm spudder problem, i have heard alot of people talking about it and i have seen a big list of things it could be. however i havent seen anyone say that it only did it sometimes. just as all the others, when i get to 3500 it spudders as if the secondary injectors dont want to kick in. but if i bring it up slowly, pressing the gas lightly it will go right up past without a problem . I'm hoping that this could narrow down the problems it could be.

 

It the secondary injectors coming online. Just about everyone has had this problem. U should search for fixes and try them.

 

its the same problem as all the others. some people just have it worse than others but regardless, the same fix for them will fix yours.