Cylinder 3&4 misfire at low revs skoda 1997 1.4L

[SkodaSlart1998]

Make model and year in title. (Oops forgot to say Skoda fabia)
At high revs, the engine works fine. At low revs, sounds like a tractor and pootles out unless accelerator pressed. Obdii says cylinder 3&4 misfire. Is it water in the fuel, clapped spark plugs or fuel injectors?

Many thanks

 

[Mottie]

I’d start with plugs and leads/coil pack first. Adjoining cylinders could be low compression - possibly head gasket? Can you check the compressions?

 

[SkodaSlart1998]

No way to check compressions. No smoke in exhaust or mayo in oil or coolant so i don't think it's head gasket (at least i hope not). I'll check the plugs.

Thanks for your help

 

[Burnerman]

You can get a compression tester for around £15.....it’ll give you a reasonable insight into the engines health.
All four cylinders should be within 10% of each other.
John