Firstly check all hose clips are tight using a spanner or socket.

Then disconnect the blue plug at the back of the inlet and then if you must (don't advise it though but its how I did mine) adjust your CO mixture.

Start the car and let idle and warm up a bit with the fan off. Then take a 3mm Allen key and insert into the adjustment screw on the metering unit. If its struggling to idle you are maybe overfuelling so turn it anti clockwise in small increments until it idles smoother. Don't worry about the idle speed as this can be adjusted later. If it makes the idle worse then turn the other way until it improves.

This should be done using a CO analyser and you are looking for a figure of 3% or less thats why the pros should do it.
Once done adjust the idle speed by turning the screw under the throttle body either in or out to decrease/increase the revs. It should be about 950 rpm.

Thats how I did mine and it starts first turn of the key, idles smoothly and drives fine.

I hope you changed the oil when you did the cam and tightened everything to the correct torque figure.