I have changed all of the ignition system(yes ngk plat) even changed the fuel filter.like I said it is mostley when the a/c is on and when you turn it it on driving down the road you can feel it the power of the engine the a/c is on but the a/c works great.is there anything that is suppose to idle the engine up when the a/c is on?

Air Conditioning Signal, which signals the ECM when there is a demand for cooling from the A/C system. Problems, here, likely involve replacing the ECM. I would ensure the Idle Air Control Valve is working properly, before tackling the ECM.

The link below may help:

https://www.askmehelpdesk.com/cars-t...tml#post842969

Your problem may be as simple as just setting the idle speed to spec:

https://www.askmehelpdesk.com/cars-t...tml#post219948