Engine Clicking And Tapping Noises problems of the 2003 Ford F-150

I bought a 2003 Ford f150 with a 4. 6l triton v8 engine , while driving it started making a popping noise, like a Mini backfire. I took it to an auto repair shop, and they found the coil pack on the #3 cylinder was melted. They replaced the coil pack, and we drove down the road to test drive the truck, within 2 miles the popping noise returned, but even louder this time. We got it limped back to the shop, and had to let it cool down overnight, so the mechanic could investigate the problem. He had a time getting the mellted "brand new" coil pack out of the spark plug recess in the engine head, and an equally difficult time getting the spark plug itself out of the hole. Apparently the plug had come loose in the short threaded aluminum head, then the coil pack melted around the plug sealing it in place , and the engine burnt a hole the size of a pencil right through the aluminum head next to the spark plug hole. The coil pack was still putting out spark, but not to the plug, as the boot that held it on the plug was gone, it was just sparking against the sides of the recess in the head. The mechanic said it was lucky not to have either caught fire or blown up, I guess that is lucky, but at the same time not so nice for me with the repairs starting at $2600 to replace the heads on the same engine, or put in a used engine if we can find one for $3900, or put in a remanufactured engine for $5200, that has supposedly has addressed the issue with these Ford engines blowing out spark plugs. Ford says there isn't an issue, but they've created a fix for the problem that doesn't exist?? what to do now with my worthless pile of metal sitting in my driveway , I can't afford to fix? built Ford tough ?? after doing some research on the internet, simply google "Ford triton spark plug blowout" , and you'll find there are thousands and thousands of folks like me dealing with this issue , and Ford continues to deny it's a problem, why?.

On 10/1/08 I was coming out of a parking lot and heard a loud popping sound. Loss of power and ran rough . It was almost dark so I could not see what was wrong so I drove it the two miles home, along the side of the road. Next morning I took the truck to holder Ford in lakeport, California and they said I had blown out the rear plug on the passenger side of the engine. They repaired it for $715. 00 and I got it back on Monday 10/6/08. Again on 10/11/08 Saturday the same plug blew out. This time I was in the fast lane of the freeway in san rafael heading for san francisco. The truck lost power and every time I backed off the gas the engine died. I fought with the truck to get it started and keep it running to get it across three lanes of bumper to bumper traffic to an off ramp. When I stopped and raised the hood I saw it was the same plug that was just repaired. I called holder Ford and they said service was closed and there was nothing they could do for me until Monday. I drove the car to a Toyota dealer only to find the Ford dealer had gone out of business there so I called a tow truck and rented a car. I was 150 miles from holder Ford and my towing would only allow 100 miles. Besides this blown spark plug almost causing an accident it cost me $400. 00 for the tow and I don't know how much for a rental car. Now I find out there are only three threads in the head to hold the plugs in, and the heads are aluminum. The truck is a 2003 Ford f150 lightning 5. 4 triton v8 with 70,000 miles.