what model is your car and how many miles does it have on it??? my 00 svt is in the shop right now for that prob. i just bought the car a month ago, drove it for a couple days and it started doing it. i got to drive the car for only two weeks then i had to take it in. i was doing the same thing, hesitating in neutral before i shifted into 3rd. my 3rd gear synchros (or synchro, whatever

)were goin out. it's been in the shop for two weeks and i STILL don't have it back. i would tell you how much it cost, but my 1 month warranty is covering it. i hope that's not your case, but that describes my problem to a tee!!! i hope you figure out what's wrong!!!