Good used condition.  Match your part number from your original exactly.  Removed from an insurance totaled crash damaged vehicle that still ran.   Engine Computer BJKW 1994 Chevy GMC Truck 7.4L 16197427 16196395 Memcal 16198038  This listing is for one BJKW engine PROM Chip - With the engine computer from the same truck. When replacing your PROM you must match the 4 letter code on your PROM from your vehicle. Do not replace a PROM with a non matching unit. Check the prom in your computer for the correct 4 letter code BEFORE you make a purchase. This is for one PROM only and doesn't include the engine computer. 

Please note, that misdiagnosis of a good working ECU is one of the primary reasons we get these units returned.  We no longer accept returns on these units without a 30% restocking fee.  We test all units we possibly can, and will test any returned units.  All units we sell are operational units that came out of crash damaged salvage cars.  Unlike most sellers on ebay, we never sell ECU's from no-start cars or from flood damaged cars!