Hi, my bro got an Escort 7 with a 1.6 zetec engine and after he got it from the sprayer a problem accured ie: it won't stay idle and every time you leave it free the engine stops! When I removed the airflow meter a checked wiring ecc and refit again came normal then just some time after just started again. Now I changed the air flow meter with a 1.8 one and when I fitted it came good then after a few miles just started with the same problem again.( When the engine doesn't stops the revs just stay going up and down) What will be the problem? Where can I buy zetec engine sensors? Thanks