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Actually its TCS(my mistype) for transmission controlled spark. It has a switch in the transmission, a relay on the firewall, a temp sensor in P/S head and a solenoid on the intake manifold. It shuts off the vacuum advance in the lower forward gears, the temp sensor overrides this when the engine is cold.
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 70 C/10 Light Red 350/TH350, HEI, Duals w/40 series Flows, 91 seat, LED taillights
99 Pontiac S/C GTP, SLP Ram Air hood, GMPP Konis & springs
95 Neon ACR, MP PCM, AFX UDP, 3.0 CAI
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