DIW...Dead In the Water...
I'd hafta agree with some of the other posts. Sounds like either fuel or electrical, PROBABLY. I'm not saying that it can't be mechanical, because it could. A lot of times tho, a timing chain needs some event to happen to make it jump.They are pretty stout. Usually it's a big backfire, or other malfunction causing quick rotational reversal that does in the chain/timing. When your just cruising along, then you get that,blah-h-h-h deal where it just dies, I usually look at electrical first, a shorted wire, or loose connection. Could also be fuel, but thats not always so instant, usually a slow deterioration of performance, marked first by stalling and rough running.
First I'd get that car away from the dealer.Sounds like they threw you to some kid that didn't have a clue, and was just guessing. Twisted crank? Yeah, right. That crank is forged, and you don't have 400HP either. Twisted sister acting as twisted mechanic. All the dealer is going to do is bill you to death before they find the problem.If thats all thats available, ask for the oldest, wisest mechanic on the line to take a look at it. Make sure you talk to the service manager about the "service" you got, and the "diagnosis" you got.Get a written estimate of exactly whats wrong with it, then get it out of there. Personally, I would not reward them with my money. Find the most knowledgable mechanic in your area. Maybe someone here has a suggestion for your area. Proper diagnosis is a slow elimination of causes, starting with the basics, not jumping to the crank or cats (clogged up in 10 miles,wow, how 'bout that-). It can run $200 to find out, but thats better than $500, and they still don't know! Do NOT tell the outside mechanic what the dealer said, just watch how he does his diagnosing, and learn. Let him come to his own conclusion.When you get the REAL problem fixed, take it back and show the same service manager what it cost you to have it diagnosed and fixed correctly.Probably less than 1/2 of what their estimate was. When I get crappy service from the people who are SUPPOSED to know about my product, and charge like they can do no wrong, I do not hesitate to berate them for their service, or remind them, that I am perfectly capable of writing to THEIR boss, Ford Motor Co. about my "dealer experience". If they look like a-holes then they deserve to be called that. I've had this same kind of dealer experience, and I have also had excellent dealer service. There is a huge difference between the two!
Also, study exactly how the air is routed thru your engine, so you understand it better. There is NO direct "supercharger to manifold gasket" like you are asking about.It IS complicated, and not as easy as a "normal" car. There is a lot more plumbing, but you want horsepower, right? I don't have time to explain it all to you, but you need to understand how it works. Study Manuals, so you know.There are several points where you could have either a vacumn or a pressure(boost)leak, but none of them will cause a car to just completely die like you described. Eliminate the simple things first, starting with electrical and fuel. As in the battery, fuses, and wires. Spark and timing. Fuel Pressure. Etc. Etc...... Good Luck!