Hi comrades.
Good morning, i am new here and i have a problem with my vehicle.

I have a Chevrolet Impala 2003 3.4L V6

The problem is when i am trying to start the engine; it does not matter if it is morning time or anytime during the day; it is very hard to start the engine, sometimes i have to try more than 5 times with the key and pushing the accelerator pedal to start the engine.

i have noticed excessive fuel consumption; and that is more hard to start the engine in the mornings than in another time during my activities of the day.

Once the engine starts, all goes ok, but when i do a stop or in the semaphore red light, the engine sometimes turn off.

Also when i parked the car in a slope, after a rough start of the engine, when i set the change to Drive or Reverse, the engine turns off.

I have already done the maintenance; they did the following things:

* Checked the Engine compression.
* Checked the Fuel Pressure.
* Changed the spark plugs.
* Changed the cables of the spark plugs.
* Checked the coils of the DIS.
* Checked the MAP Sensor.
* Checked the EGR Valve.
* Changed the Engine Oil and the Oil Filter.
* Changed the Air Filter.
* Changed the PCV Valve.
* Ultrasonic Fuel Injector cleaning.

They says "all" was ok.

This car does not have a tachometer so i can not tell you the RPMs when this problem occurs.

It has been a month since the car presented this problem.
And the maintenance was performed two weeks ago, and the problem persists.

Anyone have an idea of what can be?

i fear to drive my car because this problem.

i hope i have been clear enough with my problem.

thanks in advance.

PD: I do NOT have the "Check Engine Light" On, so i think its useless to connect the scan for a code.
am i wrong?

 

no clues?