I've been having this weird problem with my 95 Z28 (automatic) for a year now. Here is the rundown: When I am driving the car at normal speeds it shifts perfectly. As soon as I floor it and increase the RPM's up to about 4000-5500 it begins to shake and hesitate erradically before it shifts into second gear at 5800. This continues to happen with the other gears as well. Initially we thought it was a transmission problem, so we spent a whole weekend swapping transmissions with a 94 Z28, but the problem remained. We then switched the ECM computers thinking that maybe someone might have programmed it improperly, but the same problem existed. We also checked to see if the air filter and fuel filter were clogged, but they were clear. I've since talked to a mechanic and he mentioned that it might be a fuel pressure problem, maybe even the fuel pump. Has anyone had this happen to them, or does anyone have any recommendations as to how to resolve this? Any help is greatly appreciated. Thanks.
Michael