Astra h z16xep engine

Hello all.
I own a vauxhall astra h 1.6 sxi z16xep engine. The car starts and runs fine for about 20-25 miles and then starts to splutter. Before chucking the engine management light and then starts misfiring. I switch the engine off briefly and then back on and the misfire goes.
My OBD2 reader says intermittent fault with the air intake temperature sensor to which I have renewed at the cost of £120 to find the fault still exists.
Has anyone else had the same problem or is there anyone on the forum who can point me in the right direction please? The car has just passed the MOT and the garage said the emissions were really good considering the car has done just over 200,000 miles.