Ok I have a 1995 Monte Carlo Z34 with the 3.4 and ever since i've gotten it, it always revved up real high after starting it and if it was cold out it would stall unless i gave it fuel until it warmed up, then it would be perfectly fine. It's been about 6 months now and it's progressively gotten worse, now it's gotten to where it jumps up and down real bad. Now it's at the point where it is starting to die on me pulling up to stop lights etc. until the motor is up to normal operating temperature, then it idles perfectly fine. Anybody have any ideas? Thanks