I have a car pontiac 1994 grand AM and it doesn't start, fuel pump is ok, inigtion module new, coil new, spark plug new. timing bell ok... and it still doesn't start.... I would like to know where is the trouble, and what part of the car I should check.

No spark at the coil replace all spark plug wire and coil wire but start with fuel pump first it wont start anyways without fuel id look into a new cap and rotar with the plug wires might get lucky and find a distributor at a wreckers for the same price as cap and rotar

Incorrect timing? Weak spark (coil)? Low fuel pressure (restricted filter, fuel pump)? Incorrect spark plugs ? Low compression? Worn out camshaft (insufficient lift)? Spark advance (ignition module)? ECM?

One possibility is the temp sensor,if it does know it's a cold start ,it won't have an enriched fuel mixture to start.
Change it or put on a scanner and look at the temp sensor reading when cold.

ECM/PCM. Also known as electronic control module/powertrain control module.

What happend when you turn the key? Did you change the Throttle potition sensor (TPS)?

Check for fuel pressure and spark

Check out the thread below;;
http://www.fixya.com/cars/t6192660-1994_grand_cherokee_5_2_v8_shuts_offhttp://www.fixya.com/cars/t6192660-1994_grand_cherokee_5_2_v8_shuts_off

There are few things that you will have to check. 1) Is the battery properly charged. 2) Are you getting spark at the spark plugs, when you crank the car to start. 3) Is there proper fuel in the car. ---------------- If the battery is not charged properly the car will not start.Check the voltage of the battery .It should be exact 12volt. If there is no spark coming when you crank the engine then its the problem of either the spark plugs or the coil pack.the spark plugs gets power to spark from coil packs.Also check the fuel pump and fuel filter.If the fuel pump and fuel filter are worn out then it will not supply the fuel properly to the engine and this results in no-start problem. If all battery, fuel pump and spark plugs checked out OK then its time to check the wiring connections between the battery to starter and battery to alternator.This will help. Thanks. you can rate this solution and show your appreciation.

CHECK ELECTRICAL WIRES TO THE IGNITION COIL AND MODULE.IF OKAY CHECK IGNITION MODULE FUSE.

Did your check the ignition coil? These tend to go quite suddenly.