[jcruz]

Originally Posted by EthanCohen75

Regarding issue 3, maybe check the link below:
http://www.autotap.com/problem4_engine_hesitates.asp

In short, these could be the issues:
Mass Airflow Sensor
Fuel Pump - doesn't give enough fuel to the engine
Throttle position sensor
Dirty/failing fuel injectors - might be dirty and have to be cleaned/exchanged.

I'll start researching each of these areas....many thanks