The truck shut off twice today as if the key had been turned off then coasted 5-10 seconds and started back up ran just fine . I put the supper chips code reader on it and got the following codes and explanations but Honestly I dont know exactly what they mean. Here are the codes and explanations in the supperchips book. P 1693=DTC Detected in companion JTEC MOD. P 1698 NO CCD/J1850 Message From TCM/PCM. P 0121 TPS Voltage Does not agree with MAP. P0602 ECM Fueling Calibration ERROR. Can anyone transalate this . Please explain any obreviations as I wont know what your talking about, Kinda new to the CTD . The truck is a 98. 5 24V 5 speed,New lift pump with good fuel pressure and pressure gaudge, supperchip set on tow safe. The rest of the truck is stock. 210k miles. Check engine light comes on afterwords then goes off a few hours later. Dosent come back on till it happends again, Otherwise the truck runs great, no detectable smoke of any kind,no hesitation or dead spots in pedal except when it shuts of the pedal goes dead. ????? thanks Otis C