fish321

I have seen a lot of discussion of my current engine problem at Ford-Forum but not at this forum so I thought I would try here as well. OK, the engine began having starting problems as the weather got cold. It sputters, occasionaly dies out,until the engine warms up about 5 min later. I've had it in the shop 3 times now. The engine light didn't go on until the problem was well advanced. They have replaced the IAC, air filter and replaced all 6 spark plugs, without any improvement. When the engine light finally did go on, it gave a variety of error codes including a missfiring #6 cylinder. The mechanic switched the 5 and 6 coil to see if a new error code would pop on #5 but so far the engine light has not gone off inspite of continuing hard start problems.Does any one have any suggestions here ,over and above whats already been mentioned in these forums? It's getting expensive and frustrating. fish