Intermittent rough idle

[Carol Anne]

Car runs fine, but occasionally at the lights it will start to chug slightly. Rev needle hardly moves, I shifted it out of drive into neutral when it's doing it , but to no effect. Then when driving off it feels slightly underpowered, but within seconds returns to normal, and probablt wont do it again for the rest of ther day!

I know it could be any number of things, but is there any chance it could be something as simple as a bad plug? I just can't afford an expensive dealer diagnostic this month!! Any suggestions most welcome... thanks.

[spaced]

could be plugs, valves, turbo pipe anything. get it checked.