First problem is on cold start it takes my 4AGE a good 20 seconds of hard cranking before it turns over.
Secondly, when cold, it idles at around 1800rpm and falls back to about 1300rpm when warm.
If I adjust the idle screw so that warm idle is around 900rpm, if I turn the ignition off and start the car again it will turn on for about 5 seconds and the idle will drop until the car dies.
Any ideas ? I am thinking cold-start injector and idle-up system im not sure how to check these or what else it could be ?