Whenever i start my car the revs bounce for a while and as soon as i press on the accelerator the car stalls, meanwhile I can hear a sucking kind of noise at the engine and i can smell a faint fume of petrol near the fuel injector area, Its definately not an air leak as ive checked for this or the maf as that has been replaced.

Ive had 2 diags that came back with 0 errors, I have had the fuel rail out a few times after checking for air leaks under the manifold but i never replaced the O ring and the seals on the injectors could it be that these not being changed that the injectors are not sealing properly hence air getting in and causing this.

After a while the car gets going eventually and starts to run normally and this problem comes and goes and is very intermittent.

any advice as im at a loss is it important to change the seals once the injectors are out.

By the way its a BMW 320I M50 Engine 1992.