best way to test the pickup is with a scope. you need to see if the waveforms are crisp or ragged. to change the pickup, CAREFULLY lever the reluctor wheel-8 legged star thing-off the dist. shaft. there's a small pin to lock it in place. do not twist it, it can spin on it's center hub if forced. below that is a snap ring holding the pickup in place.

weak spark can be a weak coil, the green wire coming apart, poor signal from the pickup to the icu, less than 12v at the coil and icu or a tired icu. just 'cause it's bosch doesn't mean it won't wear out. a bad ignition sw could drop voltage to the coil and icu. the icu is exspensive and the reluctor is a pain to change, you want to be right. good luck, chuck.