Quickly and easily diagnose engine problems with this noid light and IAC tester set. The kit lets you check your engine for issues in the electrical fuel injection system, spark plug circuits or idle air control (IAC) valve in both no-start and stalling engines. The test kit is suitable for testing GM TBI, GM SCPI, GM PFI, GM MULTEC2, BOSCH2, FORD TBI, GEO TBI and BOSCH PFI systems. Includes eight noid lights for fuel injection systems, two IAC testers and 4 foot fiber optic extension cable to test from driver’s seat.