about 2 months ago i bought a 94 explorer limited with 66k miles. its been very well maintained and its a great truck, but (of course theres a but) its started giving me problems with being hard to start when hot. cold starts are not a problem, but if i drive it for more than 10 or 15 minutes and turn it off, it wont start again until its had time to cool. i had at the shop and they told me the problem was the emergency fuel cutoff valve under the dash. fixed that. same problem. took it back to the shop, this time they checked the fuel system pressure and it was fine, they then determined it was the camshaft sensor. fixed that, and all was great for about a week. now the problem is back and today a new twist has arisen. it died while at a stop light. it restarted again after cooling like always but im at a loss as what to do now. please tell me this is a normal and common problem and what i need to do to fix it before i go insane!