ok its confirmed, its the sensor. i swapped it out with one from my 3.0 and no probs now. well except the 3.0 doesnt have a sensor now! now i cant find the part here where i live, anyone can help me out? the part number is

md127984-3.5L 6g74 exhaust gas temp. (this is whats written on the mitsi book that i saw in the dealer)