my 2003 chevy impala 3800 has no acceleration between one third and one half pedal after half pedal it comes on hard and I have to let up to shift properly, I have changed the fuel filter and plugs and wires. Any ideas? no trouble lights or codes....
Try cleaning Throttle Body and Idle Air Control Valve. Also replace fuel filter if have not done so in a while. Add fuel injector cleaner to gas tank.