I have a 2000 Blazer 4x4 4.3ltr...having trans issues. It is an automatic but seems to require I drive it like a stick (letting off the accelerator between gears). The RPMs will climb with no shift (sounds like I revving engine) unless I lay off the gas peddle a bit, then it will shift fine. Once it gets past 2nd gear its fine, but getting it past that is a bit tricky...like I said, like drivng a stick. Someone told me it could be a sensor...any ideas? I'm hoping I dont need a new tranny.