James Reilly

my daughters 2011 cruze with 172000 miles recently had the pvc and coil pack replaced. The car has service traction control and esp? what ever the common warning flashes when the engine starts to miss.
I replaced the ground cable and cleaned 5 ground connections to the body and engine. I also checked the plug to the coil to make sure the wires were tight and not corroded. Any Ideas on what to do next?
Thanks JIm