First time poster guys, be gentle So I've gotten this car off a mate, its had some work done, heads, cam, tuned to about 270 maffless tune otr all that jazz. Now the car seems to be having a tps issue, but it happens very intermittently I could be cruising along no problems car will shift properly, accelerate properly. Then once I come to a stop and the car is sitting at the lights for a little the engine light will come on and the car won't accelerate properly, changes gears quick etc. I've pulled up the code and it says " p0121 TPS/PEDAL POSITION SENSOR CIRCUIT RANGE/PERFORMANCE " I've tried two different tps sensors, done the sensor reset where you unplug turn on off all that jazz. Anyone else come across this problem?! It's driving me nuts.