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My Kaprice has a 97 Z28 Lt1 with flowtech afterburner headers. and I only get knock sensor codes while on the highway. in town it never goes off. someone suggested Lt4 knock sensors. BTW both sensors are brand new. I've been a mechanic for the last 6 years. i can clear it and change the sensor and clear and its fine. As soon as i do a long highway drive it comes on. and it seems i can get it to shut off by getting on it for a second and get off the throttle completely and let idle down for a moment. any help would be appreciated. Thanks Josh