CPS jerking problem will gone if u install additional grounding cable. Happened to my CPS before, take out fuel-pump test it outside and it function perfectly. Install back, bring to my trusted wshop, changed plug cable (Bosch red color RM90), the jerking reduce but still there. DIY, grounding cable using welding-set cable (since i dont believe with those accessories shop cable). Connecting from negative terminal to firewall, alternator to firewall, and cylinder head (near coil) to -ve terminal and the jerking problem gone.