When do you replace the cap and rotor on a 1995 lt1?

You should replace the cap and rotor on a 1995 LT1 engine every 30,000 to 50,000 miles as part of regular maintenance, or sooner if you notice signs of wear such as corrosion, carbon buildup, or misfiring. Additionally, if you're experiencing rough idling or poor engine performance, it's a good idea to check and possibly replace them. Always refer to your vehicle's service manual for specific recommendations regarding maintenance intervals.