When you initially start the car the revs will sit at a steady 1500rpm, after running for a few minutes the car will creep back down to about a 1000rpm. At this point the revs will fluctuate slightly and occasionally drop down to near 500rpm but it never stalls. If you drive along then dip the clutch to come to a standstill the revs will drop down to about 500rpm but again will never stall.
Any ideas? I've replaced the plugs, i've ran some Forte injector cleaner through and will replacing the leads soon but is their anything else I should be checking? All in all the car is not in bad nick and all appears to be working ok.