The car is not the SRT and does idle fine so can not be the AIT sensor. I will run it for the next week with the current non Bosch CPS to see if it stalls or is hard to start (takes a few days to order the part anyway). If it runs without issues (apart from the misfire and power loss of course) then that reinforces the non Bosch crankshaft position sensor as the source. Will let you know the outcome. Thanks.