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[106pete]

I've been having a small misfire that comes and goes, mostly at low revs like 2k or less and on the odd occasion put the warning light on for a sec.

Well yesterday I fitted my spare coil pack with new leads, did the plugs last week. The old coil pack was split and little rust coming out so must have been screwing up, test run proved better but a cold start after work it still has a slight misfire while cold and I'm not sure if it's pulling up hills in low revs the same everytime.
One hill it'll do 5th gear up a hill and hold speed but another time lose speed when I don't expect to.

Now I know there's the valve on the intake and one at back of plenum but when should the operate and how do I test them? I've been searching for ages but didn't find much?

Thanks

[TheBoy]

If warning light comes on, there will be a stored code - read them