Hopefully someone can help. I have been given a 1998 Ford Explorer, however it is a nightmare to start from cold, it will rev up to 3000 rpm and then drop down and cut out. you can contol it, just about, with the throttle but you can't put it in gear until it stabilises. The MAF is fine and the air inlet gaskits have been checked are seem ok. This is my last chance. Any ideas ??