OMEX / FRS injectors / Coil packs.
Changed plugs and one had split in half, but on fitting new ones, it is still the same.
No smoke, no water loss, car idles and drives like a Scooby, with at the moment, the same sort of power.
Any other possibilties?

 

head gasket blown between cylinders?

I had exactly the same symptoms on an old clio i had (sounding like it was running on 3) - changed the plugs, HT's, Coil, u name it i changed it! - still ran the same

someone suggested my Head gasket may have gone, i was like "Yeah, as if, am sure i'd know if that happend".......so i whipped the head off to find that the gasket had indeed split between the 2 middle cylinders so they were loosing compression between each other! stuck a new gasket on, job done!

 

Hope not....just had new one not so long ago!!!

 

easiest way to tell would be to get a pressure test done, will save you a lot of ball ache in the long run

 

good advise

Chris, was there any of the old spark plug missing, it could have damaged an exhaust valve.

 

Not missing, just split!

 

Do a compression test on all cylinders with all the plugs out

 

injector not firing?