Does anyone know what a tps waveform looks like on this dual tps tac system ? It is a 1999 Camaro, 3.8 vin K, auto, 48,000 miles. I am going after codes P1221 and P1516. Alldata's P1221 chart step 14, says to replace tac module at gas pedal, but I'm not 100% s... Login to read more.