I own a 2005 golf gti 1.8lt. The other day the EPC light came on, followed by the traction control light, and then by the engine light. i lost all horsepower. i turned the car off a couple minutes later and back on the EPC light and the traction control light went away engine light stayed. the car was running fine then. the next morning i turn the car on an it begins to idle very erratically between 800 and 1200 rpms. when i gave it some gas it was fine but the second i let it idle it would continue to do it. i initially though the TPS but then later found out the my vin does not have a TPS. it apparently have some sort of sensor on the side of the gas pedal and one on the throttle body. both of them can only be obtained by purchasing either the whole trottle body ($570) or the gas pedal assembly ($180). PLEASE someone help me trouble shoot this problem.