Slight misfire in my momo

[punkyy8]

My car has a slight misfire in it, replaced the spark plugs yesterday and it slighty improved but when sitting idle the revs are constantly dropping, is this a common problem? The spark leads in the car aren't that old and they are aftermarket red NGK as far as I can remember.

I know all cars revs slightly drop below 1000 when on idle rev but it is very noticeable on the car.

Any advice would be great

[aaron eunos]

im in the same boat myself i repaved the leads after giving the plugs clean and still no joy which is leading me to believe a coil or distributor problem

[MX5Spares]

Most lightly to be the coil !! We have several types are there are different amounts of pins on the actual coils themselves depending on year ,size etc

[indie]

just fixed this problem in my own car.
recently i changed the leads and plugs and it went away, but not completely.
it started to get worse so i changed one of the coils, the one that controls cylinders 1 &4, at the same time i pulled all the plugs to check them and found a cracked insulator on one of them.
i replaced them all and its back to normal at last.

[MX5Spares]

If the leads have been replaced anytime recently it nearly always the coil/coils as the tend to overheat a bit where they are positioned on the engine.New they are a fortune but we have good used ones for sale. In saying that I have a few lads in the UK that actually keep a spare coil or two in the boor just In case ......so it speaks for itself really....minor issue really and easy to fix at low cost.........so not bad for oldish car........