How do i keep my truck from vapor locking?

SOURCE: 2002 taurus passenger door lock

Mine did this. I went around to each door and sprayed a liberal amount of WD-40 in the latch, then open and closed each door about five times. It hasn't done it since. I think the switch inside was not moving freely.

SOURCE: misfire on cylinder 6 at idle

I mention motocraft because too often I hear about challenges with plugs on fords. I too purchased the big buc iridiums and had 6/8 success. Belong to another truck site and read a lot about this and cel's. If the light is flasing in and out this could be a vacuum problem. I belive Relaga is speaking of the two vacuum hose coming out of the intake. One will be right after the MAF and runs to the engine, and the other after IAT sensor and runs toward the throttle body. Take a peek at the intake and ensure it is connected properly and securely. As it runs up toward the throttle body and right after the air filter you run into the MAF sensor. then a vacuum hose, then the Intake Air Temp sensor, then a straight shot to the throttle body. The air intake assembly connects to the throttle body. Check the entire assembly for any leak and those vacuum hoses. What I also suggest is you remove the entire air intake and clean it. First Disconnect the negative terminal on the battery. The sensors disconnect at their wiring harnesses and you do not have to remove the sensor itself (inside tube). As you look inside the intake (once taken apart/off) you will see the sensor (s) inside through the grommet. You can purchase a bottle of CFC MAF/Electronic cleaner at any auto parts store for about $9 and spray the hell out of the sensors like you would spray a cockroach in the face. About 4-5 seconds. NEVER put your finger inside and touch the sensor. The two tiny wires you see are very fragile and delicate and should not be handled. But the spray is fine. Wait 20 minutes for the electronic parts to dry and re-assemble. Double check all connections and reconnect the sensors and then negative cable on battery.

Hey just found this thread for us. Check it out.
http://www.mechanixtrix.com/Article/Article.aspx?ArticleID=45

SOURCE: 1988 ford thunderbird (not se) 3.8L v6 vapor lock

Vapor lock cannot occur in a tank mounted fuel pump. The pump may be worn enough to lose it's pumping ability at high temperatures. Have you changed the fuel filter? Is the check engine light on? If so, rent a scanner, read the code(s) and follow them to repairs. What occurs when the temps reach 96 degrees?

SOURCE: 1996 ford f150 inline 6 4.9l starts great cold but

Check for a bad temperature sensor. If there is any code, read it with a scanner, and it will usually tell you what is going on.

SOURCE: My 1994 E150 van with the 5.0 idles ''up'' and ''down'' in ''Park''

check ignition timing