rocking engine

The exhaust fluid is condensation...when at idle, will it run on it's own? Last tune up was when?

yep the car starts and runs fine, i left it standing for an hour yesterday with the engine running whilst washing it. ive only had the a car a week(forgot to mention) the spark plugs look brand new so i guess the previous owner has had a go at a tune up but couldnt fix the problem. i tried another coil from my friends car to check whether that was the problem but it only took away a small % of the rocking. aLSO to mention im just learning about mechnics.

i pulled off the spark plugs and cylinder 4 is a gold/yellow colour and the spark plug has the same colour liquid all in its thread, any ideas folks.

I would run a compression test. Could be the cylinder is weak and able to fire properly. Pull 1 spark plug wire off at a time and see if the engine changes in the way it idles, rougher or smoother. If it doesn't change that wire is bad and needs to be changed. Have you checked your cap and rotor?

ive pulled off the spark plug wires one at a time, cylinder 1 and 2 made the car almost cut out but 3 and 4 make no difference the coil/cap ditributer is fine, its firing good. so wait till payday and ill change the wires. i going to try flushing the engine and then use some valve sealent has a tempery fix. do you think this mite diagnose my problem or help to.

You must do a compression test, wet and dry!