I have a 2000 monte carlo with a 3.8 it is hard to get started when i finally get it going after about 20 min starts jumping and sputtering in low RPM's i floor it once it gets around like 3000, 4000 it takes off again until the rpm's go back down then it starts jumping again. cuts off at traffic lights.then have to pull over let it cool down for about 10 min get it going again. replaced EGR valve, rear 02 sensor, coils are fine getting plenty of spark. i can hear the fuel pump come on when i turn the key on. Please help if you have had a similiar prob please let me know the solution.