I just bought a very clean 2001 PT, 2.4L with a Whipple Supercharger, 90800 miles. I got it for a bargain price because of existing trouble codes from cyl#3 of P0203 (injector) and P0303 (misfire). I did a compression test on cyl#3, it read 150#. I changed plugs and plug wires, cleared the codes, and now only P0203 comes up (injector circuit fault). It feels like it's running on 3 cylinders. I removed the injectors and had all 4 serviced at Dr.Injector, all 4 were OK. The service tech told me to check the wires to the injector because that code is an electrical fault that indicates a short or open condition. I checked continuity and resistance of all the injector wires and used a 12v test light probe with the engine running to check for power in the positive wire at the PCM going to injector #3 (all OK). It appears there is a single common ground wire from the PCM going to all 4 injectors. I cleared the codes again, started it and the P0203 came up again. I've been reading the posts here for the injector circuit fault codes and no one has reported back what their solution was to this problem. I know that the PCM uses the signals from the cam position sensor and the crankshaft position sensor to fire the injectors and plugs, has anyone here heard that replacing either of these actually solved an injector circuit problem? It doesn't seem logical but I'm stumped here. I'm hoping it's not a problem in the PCM (computer). Any ideas?