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Possibly the TCS (transmission controlled spark/temperature controlled spark) relay, or maybe the horn relay. Some folks just delete the TCS system altogether since its purpose is to limit ign. timing advance to occur only when coolant temp is above 82* and the trans is in high gear.
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'72 GMC SWB C1500 Custom, frame-off in progress. 383 SBC, 9:1CR, Comp Cams XE262H, Scat internal balanced crank, Eagle SIR 6" rods, Keith Black dish pistons, Dart Iron Eagle 72/180 heads, Weiand Stealth intake, Stewart stage I water pump, Holley 4bbl vac sec, TH350 with B&M Shift Improver Kit. 12 bolt positraction.   
Last edited by Sweet72; 03-20-2004 at 10:19 PM.
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