2001 Honda Accord Alternator problem

It's not your alternator that is causing this (well it's very un-likely)

What you most likely have is either a dirty throttle body that is in need of a service or a dirty IACV motor (idle air control valve).

First thing I would do is have a good throttle body service done that will clean out all idle ports and the throttle body.

Sometimes it would not start after long periods of not driving say like 4-8weeks. You sure it is not the ECU. There is some type of code that the mechanic has told me about to replace.

There's a code?

Do you mind retrieving the DTC and posting it up please.

And I cannot say for sure that it is not your ECU, however, from the symptoms you described it does not sound like something that is the ECU's fault.

Computers and Control Systems
Code P1106
DTC P1106: BARO Sensor Range/Performance Problem

The BARO sensor is inside the PCM/ECM. It converts atmospheric pressure into a voltage signal that modifies the basic duration of the fuel injection discharge.


Thats what the paper says. This was about 3years ago. About 1 year ago i had to recharge my car with my brothers SUV and it started up good again for about a few months but after that the idle started to get sluggish. Ever time i make a stop at a light the rpm goes below idle and goes back up but stays below and near normal idle.

Ok i cleaned the throttle body with a special spray and engine is running far better with little or no rough idle. Where is the IACV motor located?

Thanks

IACV is located at the back of the intake manifold on most hondas. It will have two 12mm bolts holding it in and 2 coolant hoses running to it. They usually look like this.