klang have indeed a ground of good food if you really know the places real well. I can assure you if you follow my below guide you will come back for more.
1) Pandamaran stall hawker: You should try the "yoyo ice" bobochacha mix with red bean. It has the smoothest yoyo ice and the taste are supurb. I bring a lot of friend to try and everyone go for second glass. ( If compare this with the yoyo ice that is being sell in the fried chicken cuz fried chicken yoyo ice are sucks.....)
2) Pandamaran famous "cai ge" .....only pandamaran sold it. And trust me not just the cai ge.....they have the best goreng pisang and cucur udang too. The taste are totally authentic......you will get the feel of 1980's feeling.
3) Ah he ba kut teh....the only sell at night ( 5.30pm to 8pm) The fastest selling ba kut teh in klang area. Try it and you will know it.

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If you want seafood....perlama and yong tat is the best choice though if you compare to sekinchan and tanjung sepat....we might not be able to fight.

And also Da tuan Yuan in bukit raja which serve the best steam fish.
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not that one....that taste sucks....you should head to Jalan besar in pandamaran.....i bring a lot of my friends to try it...indeed receive a good review la....imagine the ice are equally soft like blend and the bobochacha...the yam is sweet...and thick santan aroma.....
the whole road has a lot of hawker stall where you can find a lot of good food there......and indeed it still maintain its authenthic taste.....