3.8L shutting off
 

my 07 T&C 3.8 motor shuts off on its own as if the key is turned off. while driving down the road the van will shake as the motor turns of and on some times only once as a stuter other time like 5 times off on off on off on again and keeps running . If at a stop light it may idle slightly rough and shut down somtimes after the light goese green and shuts down halfway through a left turn or straight. sometimes it may take a few time for the motor to fire when restarting. Ive tried turning the key off while going like 50mph and its the same effect. a month ago my tranny started slipping and taking some time for the van to move so in had a shop install a new tranny. before this install I had shop look into the stalling thing and they were all clueless. after the new tranny i hoped it was going to be fine but it still stalls. any help??:confused:

anyone:confused: