Gerry
I was there 3 months ago. Excellent fishing, I will write an article and post to FM soon.Like most places overseas, you'll need to havelocal contacts. Suggest you join'Malaysia fishing net', they are a helpful bunch.
The fishing available in and around KL includes commercial freshwater fisheries with large Snakehead, Pacu and Catfish. There is one in particular I can recomend: Tow Foo Fishery. There are also saltwater payponds if that's your thing, and decent inshore boat fishing, which you can arrange through Malaysia fishing net.
If you need to know anything else, let me know!