heyzah

Ive just bought a r33 rb25de that was sitting for 5 years. Did simple service by changing the fluids, filters, spark plugs and coolant temp sensor. Sadly the car misfires badly, idles badly (sounds like its going to stall) and over heats. The over heating is probably due to the broken water pump.Ive done a bunch of research and it seems like there is a ton of variables that could cause my problems. I was wondering where would be the best place to start to help fix my problems?