I need some help. My wife's 2002 cabrio started having issues the other day. It would run fine but after driving for a while, it would stall. It would startup and then after a while run rough and then stall. Code said Engine Speed Sensor or CPS. I replaced it with a Hella CPS. The car started but ran rough, stalled and then would not start at all. I replaced the CPS again, thinking that the new CPS was bad. Still no start, just cranks. Tach goes to 200 RPM on crank. I've tested the connection to the coil. Power and ground is good, but no light at all on the center connection. It should flash. I've checked all connections. Any help or ideas? Please?