toyota camry

My Camry sputters/ surges throughout the rpms, some pinging, the plugs,cap,coil/distrubuter,timing belt were changed by myself and bro. I've been doing this awhile. We've checked and rechecked the timing and set it perfect with specs, yet when hitting it with the light, and looping out the ECM the mark jumps eratically, the valve adjustments are in spec. Any suggestions would be helpful.