Engine won't turn over

The coil pack is bad have it replaced along with plugs and wires that should solve your problem. Hope this answer helped out.

if now it won`t start it could be a spark(ignition)problem, check for spark at the plug. you should check for a code in the pcm this may help, not all codes set the check engine light. could also be a bad fuel pressure problem.

engine won't crank, or won't start ??

Must not have been much of a mechanic. If the engine runs and sounds fine sometimes and other times it doesn't then it does not sound like a mechanical problem with the engine. Sounds more like a issue with either the ignition system or fuel system.

Check for spark and fuel. When you turn the key on you should hear the fuel pump in the tank for a few seconds till the pressure builds up. When you crank the engine there should be spark at the plugs.

If the timing belt went or slipped you would have backfiring or worse. It is likely another issue such as cap/rotor, control module, sensor(s) or fuel pump. Is the check engine light on?

Hope this helps.

The coolant temperature sensor on the 2.4L DOHC engine, (which I will assume you have) has 2 functions, one is to send temperature to dash gauge, the other is to send signal to PCM . That signal changes when cold, which results in PCM sending a little richer mixture (more) of fuel to engine and speeds up idle until engine gets warmer, or normal operating temperature. It should be located right under housing where upper rad hose attaches to engine.

I have a 2001 dodge stratus it started everything worked fine untill i took the radio out to put in a aftermaerket in, now the car wont start but everything works normal

If you changed the engine go back to where changed it and tell them it fails.

the alternator is u/s and now the battery has gone flat