Van starting issue-need advice.
 

I have a 2000 Ford Windstar as my mountain vehicle and I had a recall done 2 weeks ago and the car had issues starting. It would crank and but would not start. It would take 4 or 5 tries to get it started. So I paid the dealership to take a look at it and they told me they scan my van and told me I need a new key because of the transponder in it is going. They ended up resetting my ECU and said if it got worse bring it in for a key to be made. But when I went home my spare key had the same issue. A few days ago the van won't even start. Wondering if its actually its actually my keys that are the issue and not the module in the ignition or some other factor. How would both keys go bad at the same time when I use one key more than the other? Both keys are duplicate of the original key that was lost. But the keys been working for 8 or so years now. Any Advice would be appreciated.

Spark plug?

Hm... it could be several things... start from battery, coil, spark, and so on... cuz if key was causing it, you would of felt it since those keys were used from beginning

Alrighty...thanks for the replies. Now I gotta find time and the right weather to check that.