I have a 96 Chrysler Cirrus that runs perfectly until the engine gets warm. I've replaced the plugs, wires, distributor, cap, fuel pump, crank sensor, heat sensor, ignition module. When the car throws a code, it just says misfire on multiple cylinders. When it is warm, if I back off the throttle, after a few minutes the car will run again. At times the car will slow down to 5mph and if you keep driving that way, all the misfires go away and it drives fine. Any ideas as to my problem?

I agree with the carbon....my 96 also had a bad carbon build up in the metal tube to the right of the intake manifold...what i did was took it off and soaked the tube in gas for 1/2 hour the blew it out with compressed air....while your at it you should clean that port on the intake where that metal tube was.....once all carbon chipped away, it is very important that you vacume the inside of the manifold....how you do that take the air intake off and stick your shop vac on that port where the tube was, then open your carb by hand and that should clean it right out!
VERY IMPORTANT THAT YOU FILL YOUR TANK WITH A GOOD OCTANE GAS ONCE A MONTH TO CLEAN THE CARBON BUILD UP

Faulty computer
faulty wiring
excessive carbon in combustion chamber, when hot, pre-ignition occurs. try using high octane gasoline first, but wait until empty, before filling up. it will take some time before the new gaz gets to the engine as the gaz lines and pump still have the old gaz.

another possibillity is water in the gaz tank.
when cold the gaz enrichment might compensate .