I have a 1996 dodge Intrepid, I have changed the plugs, wires, cam sensor, crankshaft sensor and the coil pack, and still running rough, now it wont start

possible fuel pump failure or coil -coil pack bad - or timing belt needs replaced

I changed, spark plugs, wires, coil pack, throttle position sensor, air fitlter and clean the throttle bodies.

The car still idles rough!

Down on front bottom of engine block. Follow the spark plug wires to coil packs and ignition module. Then there will be two or three more wires that run from there down to the crankshaft position sensor.

More then likely yes, I would check your Crankshaft sensor, that what send the signal to the coil packs then to the spark plugs, the sensor is held on with a 10mm bolt on the side of the engine block on the passenger side.

i got a1996 dodge intrepid 3.5 L .the spark plugs 1,3,2 works but 4,5,6 do not work. i changed the spark plug wires, the coil ,the crankshaft sencer and the camshaft sencer.what else could cause this not to start?

Try mass air flow sensor.

The timing light connects to the number one spark plug wire. (closest one to you on right side). Than aim light at crankshaft pulley. You will see a tiny arrow next to the crank shaft,
Shine the light with engine running. Point down exactly at arrow. You will see numbers flashing next to arrow on crankshaft. +5 0 -5
You want to arrow to be pointing on 0

Any car that has coil packs and NOT distributor is called distributorless. These cars are self timed by the computer. All the sensors in the car go to the computer. Than the computer adjust timing, fuel release and more.

Replace the inginition wires. buy a good set they run about $70. the engine makes a lot of heat and wires only last a year or two. I replace mine every year seams easiest thing to do.

I don't know if you have a coil pack or spark plug wires but this is what you need to check for the miss you can also try this website if needed for diagrams and instructions autozone.com or your local library

Check the connector at the coil pack/module. Four wire connector that supplies the coil pack with power and signal from crankshaft sensor.