Car surges when A/C is on

Good morning,

Are there any codes?

If you have an EGR valve not seating, it could do this issue.

https://www.2carpros.com/articles/engine-surges

Roy

My car has no EGR valve so mechanic suggested new fuel pump. so I had him replace that. still surging I'm really getting frustrated now.

The fuel pump will not do this.

I would think that the injectors may be varnished up. Additives have no effect on the cleaning out of the varnish.

You need to have someone disable the fuel system and hook up a gauge and use cleaner directly into the fuel rail and run the engine on it until the can is empty. Then see if it still does it.

roy

Injectors are brand new.

What else have you done.

Roy

Injectors,fuel pump, MAF sensor ,throttle position sensor, comp , plugs ,wires,cap ,rotor all new gadgets ,fuel filter.

Injectors,fuel pump, MAF sensor ,throttle position sensor, comp , plugs ,wires,cap ,rotor all new gadgets ,fuel filter and checked for vacuum leaks.

You either have a vacuum leak or possibly the catalytic converter may have a restriction.

A lot of parts with no result.

Roy

Well it's fixed Roy. the IAC was carboned up so took throttle body off cleaned the IAC and all the carbon throughout the throttle body and it is now running perfect again .

Good find.

Roy