i changed crank sensor and cam sensor and coil pack and my 1997 town and country lxi not getting any spark

look at the upstream o2 sensor wire. see if it has come loose from holder and has fallen down and melted to the exhaust manifold. This will blow the fuse to PCM

you will need to slide up under vehc. to insp wires

If you are using after market parts your problem my be that the parts are defective. The cam sensor uses a magnet to generate a signal. To put it simple the magnet moves through a coil generating an electrical impulse. If the magnet is weak the signal is not strong enough to be recognized by the car and it simply cranks. I used a simple method to test the viability of a replacement part. I took the bolt that holds the sensor and placed it on the flat area of the sensor and slowly rotated it in my hand keeping the sensor level. If the bolt fell off the sensor it is not strong enough to provide a strong enough signal to the car. I went to four different parts stores and tested their replacement sensors; all failed the simple test. I ordered a MOPAR part (I HATED DOING THIS) and it passed my test and the car started immediately.