CPS = Crank Position Connector, just follow the lead from the sensor located about the
7 o'clock position around the crank pulley up to it's connector, they are white, will possibly be in a metal bracket on side of engine just pop out.
Try mr wiggles test first when it is running as this may cause it to fluctuate/conk out refuse to start, but at least you'll have defo found the problem!!
tabetha