Freestar Van Is Losing Power On Acceleration?

My '06 Freestar is losing power on acceleration. The RPMs drop to zero, the battery light comes on, and the red security system light on the dashboard lights up for a few seconds (usually only flashes when van is off). As soon as I release the gas pedal the power comes back. This tends to happen a lot around 75-80 km/h when the van is shifting gears (but not always at this speed). The sound is like a backfire On a few occassions the van wouldn't start in the driveway (would turn over) and then started again later on.



Its possible TPS or fuel supply problem.