simpest method for eliminating the EFIsystem or idle air control as possible faults on no-start vehicles >disconnect the fuel injectors ,plug in a noid lite ,and crank the engine ,a flahing light indicates normal pulsing voltage >expanded set of 8 specific noid lites covers:GM PFI ,FORD TBI,GEO TBI,BOSCH PFI,GMTBI,GM SCPI ,ANDnow new applications of bosch 2 and multec2 ,plus 2 GM  IAC testers (flat and square 4 connector applications )with red and green LEDs