2000  Buick Lesabre 3.8L service engine soon.
New cam sensor wiring checked reset codes. Light came back on and was told may be crank sensor
or the pcm. I am at  a loss. The car is harder to start and idles rough no stalling and hesitates some.

Question = what should be checked first service engine light cam sensor was bad replaced  with ac
Delco light came back on with in 10 miles  took it back  was told crank sensor may be   bad  or may
have a bad pcm. He  wasn't sure and didn't  want to spend my  money. The car is  harder to start at  
times. It was  dead once on third  attempt  to start  it started right up rough idle. Not as much pep.  
Also the door locks will lock and unlock at  times for no reason while in  park idling.  Where would be
a good place to start?

There are a couple things you can check out. First off, the
3.8 liter engines are known for bad fuel
pressure regulators. The diaphragm inside it breaks and fuel gets sucked into the intake through
the vacuum line. This creates a hard starting condition due to too much fuel being introduced in
the intake. This is an easy check. Get the car hot, preferably after driving a while. Remove the
plastic engine cover and you can see the fuel pressure regulator on the fuel rail. Remove the
vacuum line that goes to it and let it sit a few minutes. If you see gas start to leak out the hole of
the regulator, you know it is bad. Even if you can just smell gas, I would recommend replacing it.

Another thing to check out, and that is known to cause problems like the one your having, would
be the Mass Airflow Sensor. You can tap on it while the car is running and see if it stumbles or
dies, or better yet, if you can get the car to act up, unplug the sensor and see if anything changes.

I wouldn't be too sure about the crank sensor, when they are faulty it will usually cause a stalling
condition when hot, and you don't seem to have that issue. If all else fails, I would check fuel
pressure and possibly scan for any trouble codes and go from there.
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Hard Starting and Cam Sensor Codes
Fuel Pressure Regulator